Suppose you traveled back in time and located the first animals to have evolved feathers. You found that these animals were tree-dwelling ectotherms, able to run quickly but unable to fly. You also noticed that only males had feathers. Which hypothesis of feather evolution would these data most support? Feathers initially evolved in a role associated with ________.
Answer:
Feathers initially evolved in a role associated with sexual selection.
Explanation:
In species where only males had feathers, these feathers can be considered to have evolved into a role associated with sexual selection. This is because in these species, males used their feathers as a sexual attraction for females, in this case, females chose the males that had more attractive feathers to mate and generate new individuals for the species. An example of this can be seen in the peacock, where the tail with lush feathers is only present in males and is intended to sexually attract females.
A sealed Ecosphere is able to perpetually sustain life until what happens?
Answer:Oxygen is DEPLETED
Explanation:
define ostia in science
Answer:
Ostia are tiny pores present all over the body of sponges. its function is to let the water, along with desire nutrient flows interior of the sponges.
Answer:
An opening, a passage.
Explanation:
science - Anatomy
ANSWER AND I’LL GIVE BRAINLIEST
Which of the following statements can you infer would happen If one organ system stopped working?
a. The other organ systems would have to work harder to make up for the broken system
b. The other organ systems would stop working too.
c. The other organ systems would still work on their own but might have to work harder to complete their function correctly.
Answer:
b
Explanation:
After one system shuts down, the others would slowly start to shut down as well until the body can no longer maintain homeostasis and the person would slowly die. 3. All systems would be working together but the main ones would be muscular, nervous, and skeletal.
What happens during S phase?
O A. Chromosomes are duplicated.
O B. DNA separates into two nuclei.
O C. The cell splits in two.
O D. Cytoplasm is manufactured.
Answer: A. Chromosomes are duplicated.
Explanation: This is the correct answer on the quiz.
Chromosomes are duplicated in S phase. Therefore, option (A) is correct.
What do you mean by S phase?
Between G1 phase and G2 phase, DNA replication takes place during S phase of the cell cycle. The processes that take place during S-phase are tightly controlled and highly conserved.
The cell replicates its genetic material entirely during the S phase of DNA synthesis; At the end of S phase, a normal diploid somatic cell with a DNA complement of 2N acquires a DNA complement of 4N.
DNA synthesis or replication occurs during the S phase of the cell cycle, which occurs prior to the interphase. Before entering mitosis or meiosis, the cell's genetic material is replicated in this manner, leaving enough DNA for daughter cells to divide.
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2. Slime moulds cannot be put neither in kingdom Plantae nor in kingdom Animalia. Give reason.
3. Give the disadvantages of the two kingdom classification.
Answer:
3. In the two-kingdom classification following are drawbacks:-
The plants comprised of photosynthetic and non-photosynthetic species. Fungi, that feed on dead organic matter, were placed under photosynthetic plants. There was another class of classification needed were the organisms with the same characteristics were clubbed into one kingdom. This system did not distinguish between the eukaryotes and prokaryotes, unicellular and multicellular organisms and photosynthetic (green algae) and non-photosynthetic (fungi) organisms. There are some organisms which neither fall into plant nor animal kingdom like Lichens.Explanation:-
Hope my answer is helpful.. If yes, plz mark me as brainliest
See the image below!
Answer:
it is cytosine part of deoxyribonucleic acid
Besides plants, what other factor distinguishes one biome from another biome?
(A) the number of plant species in the biome
(B) the variety of animal species
(C) average temperatures and precipitation
(D) geographic location
Una especie de mariposa presenta rasgos fenotípicos diferentes entre los miembros de sus poblaciones. Estos rasgos van desde una coloración verdosa y antenas cortas (características recesivas). El fenotipo más común (características dominantes) de esta especie es de coloración amarilla y de antenas tan largas que se pueden doblar. Realice el cruce entre dos mariposas que presentan fenotipo más común, pero de genotipos heterocigotos y determine los posibles rasgos fenotípicos que se pueden presentar.
Answer:
can you please translate for us into English
Write one functions of seed.
Seeds serve several functions for the plants that produce them.
match each term to its definition
a steam of plasma
Answer:
The solar wind is a plasma, a stream of charged particles (ions and electrons) that are continuously escaping from the Sun into the interplanetary medium.
answer these two please
Which ocean borders the western coast of South America
Answer:
Pacific Ocean
Explanation:
here is your answer
Whch part of reproductive system produces semen
What are true of multicellular organisms
Answer:
hope this answer help you
Which inference can you make about why finches have adapted different beak sizes and shapes? (1 point)
They are different species.
O They live in the same location.
O They eat different foods.
O They have a wide range of variation
Finches have adapted different beak sizes and shapes because they eat different foods. So the correct option is C.
What is natural selection?Natural selection is a mechanism for evolution to happen. It is the process by which living organisms acquire certain characters according to their needs.
It is important to understand natural selection to understand the essential concepts of the processes by which living organisms have been able to develop the complex structures which are helped them to survive.
Natural selection results from various conditions of environment, ecosystem and heredity. An example of natural selection is the development of antimicrobial resistance to pathogens.
Finches are known to have developed different sizes and shapes of beaks according to the kind of food that they eat. If they fed on insects, they had long and pointed beaks. If they fed on seeds and nuts, they had broad and blunt beaks.
Therefore the correct option is B.
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HELP ME PLEASE FASST
Which of the following describes a scenario that could increase the winds of the jet stream?
O Faster global convection currents
O Decreasing radiation from the sun
O Equal heating of the Earth's surface
O Stopping conduction from the ground
Answer:
faster global convection currents!
Fortunately I just took this quiz and received 100%!
The statement that explains scenerio that can bring an increase to winds of the jet stream is A: Faster global convection currents.
Jet streams can be regarded as a fast flowing as well as narrow and meandering, air currents which is found on Earth and other planet. It is a bands of strong wind which moves to east from west in the globe.The wind of jet stream do increase by the action of wind current, because convection current do aid the movement of this this wind from a place to the otherTherefore, option A is correct.
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In the scientific process, what is the correct sequence for the following steps: A: Recognizing a problem/Asking a question; B) Testing a hypothesis; C Drawing inferences
Group of answer choices
ABC
ACB
CAB
BCA
Answer:
ABC
Explanation:
Ask questions, make a hypothesis, test the hypothesis, analyze results, draw conclusions, communicate results.
ASAP
Identify the error in the following statement: “Photosynthesis is a chemical reaction that takes place in the chloroplasts of green plant cells, where light energy is used to convert glucose and water into carbon dioxide and oxygen.”
A. “glucose” and “carbon dioxide” should be switched
B. No errors
C. “water” and “oxygen” should be switched
D. “chloroplasts” should be “mitochondria”
Photosynthesis is a chemical reaction that takes place in the chloroplasts of green plant cells, where light energy is used to convert carbon dioxide and water into glucose and oxygen. Option A is the right answer.
What is photosynthesis?Photosynthesis is the process by which green plants prepare their own nutrients with the help of sunlight, water, and carbon dioxide.
Photosynthesis helps plants to prepare their own food, these plans are called autographs.Photosynthesis takes place inside the protoplast.This process takes place in some other organisms other than green plants.Chlorophyll is the green pigment that is required for this process to take place.The end products that are formed in the process of photosynthesis are glucose and water.Hence Option A is the right answer.
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A pseudogene is a Group of answer choices second copy of a gene that functions when the original copy becomes damaged. gene that is unrelated in sequence to another gene but has the same function. gene that evolved by gene duplication and the acquisition of mutations to yield a gene product that has a slightly different function from that of the original gene product. gene that arose through gene duplication, but by acquiring mutations became nonfunctional.
Answer: Gene that arose through gene duplication, but by acquiring mutations became nonfunctional.
Explanation:
A gene is a functional unit of heredity formed by DNA. They possess a sequence of nitrogenous bases that during translation is read by ribosomes to produce molecules called proteins. A pseudogene is a DNA sequence that resembles a gene, but which has been inactivated in the course of evolution by mutations in its sequence. Thus, it is a gene that derives from other known genes and whose functions are different, may have lost their functionality or have radically changed it. To this day, it is not known exactly how pseudogenes are created, however some theories are as follows:
1. A gene duplication can generate two copies of a gene when only one is needed. A mutation would then occur that deactivates one of the copies. In addition, the duplication event may not be complete, so that the copy has incomplete promoters.
2. They may be fragments of the messenger RNA transcript of a gene may be spontaneously reverse transcribed and inserted into the chromosomal DNA. They lack the promoters of normal genes, so they are not expressed normally.
3. A gene may become non-functional or inactivated if such a mutation becomes fixed in the population. This can occur by normal means such as natural selection or genetic drift.
Answer me!!!!
Read the descriptions of two experiments below.
Experiment 1: A group of students did a test to see if the
acidity of water affects the growth of pea plants. They
followed a logical method and performed their experiment
once, using a control group and experimental groups. The
results supported their hypothesis.
Experiment 2: A group of students did a test to see if the
acidity of water affects the growth of bacteria in the water,
They used a control group and experimental groups. They
repeated their experiment several times and received the
same results each time.
Which experiment is more likely to be reliable, and why?
O A. Experiment 2, because it gave the same results every time
O B. Experiment 1, because its results supported the hypothesis
O C. Experiment 1, because it followed a logical method
O D. Experiment 2, because its setup included a control group
Answer:
A
Explanation:
Because it is giving you the same results ( i just did the test and got it right)
Answer:
a.
Explanation:
just took the test
Economic impact of agricultural pollutants on water sustainability for agricultural production. summarise your findings in a table form
Answer:
nalaqdua
Explanation:
sbospka ai9wlhzux5 s8fvekg
q.no. 5 answer me please please please please please please please please please please please
Answer:
(a)The strength of natural fibers is very less as compared to synthetic fibers. Natural fibers are heavy in weight. Natural fibers can be damaged by moths and other insects. These fibers are not wrinkle-free. These fibers are not long lasting and hence not durable.
(b) Cellulose is termed as polymer because it is made up of many monomer units.
(c) Rayon is first man- made fibre it is known as artificial silk because it have properties that are similar to silk.
(d) Rayon possesses many properties of natural fibers since it is a semi-synthetic fiber. Nylon is a synthetic fiber and has properties that are completely different from natural fibers. The key difference between rayon and nylon is their resistance to wrinkles and tears.
(e) Nylon has since become a popular choice, as it has excellent wind resistance, good elasticity, mildew resistance, and is comparatively cheaper. The material is also lightweight and dries quickly.
(f) When the piece of cotton is burnt then it burns completely and produces no odour or smell. When nylon is burnt, It completely burns and produces burning paper like odour. When nylon is burnt then the nylon is completely shrink and starts to melt first and then produces odour during the time of burning
Một các thể của một loài sinh vật khi giảm phân tạo giao tử. Trong số giao tử được sinh ra người ta nhận thấy số loại giao tử mang 2 NST có nguồn gốc từ mẹ là 6. Quá trình giảm phân diễn ra bình thường, không xảy ra trao đổi chéo.
a. Xác định bộ NST 2n của loài và tên loài.
b. Tính tỷ lệ loại giao tử nói trên?
Cho rằng tỉ lệ thụ tinh của giao tử đực và cái đều là 100%. Toàn bộ các hợp tử đều phát triển thành cá thể con.
Answer:
i cant understand
Explanation:
because your language in vietnam
During a stay in the hospital, an accident victim develops symptoms of bacteremia. A blood sample shows the presence of Gram-positive cocci in pairs. Lab tests determine that the bacteria are non-hemolytic and bile salt tolerant. The bacteremia is likely due to
Answer:
Enterococcus.
Explanation:
Enterococcus is reason for nosocomial infection with predilection for older patients with multiple comorbidities. It is usually caused by longer stay in hospital. The infections may include urinary tract infections, wound infection and intra abdomen or pelvic infections.
Two lizards with different coloring exist within the same ecosystem. One lives in the trees, and the other prefers hiding among rocks. They are separate species because
they behave differently
Othey have different characteristics
Othey cannot successfully reproduce
Othey exist within the same ecosystem
Natural selection is that the process through which populations of living organisms adapt and change.
What are the adaptations behavior in organisms?
Many animals are well adapted to biotic and abiotic conditions due to behavioral, physiological, or structural adaptations that increase their chances of survival and reproduction.
Behavioral - responses made by an organism that help it to survive/reproduce..
Physiological - a bodily process that helps an organism to survive/reproduce.Structural - a feature of an organism’s body that helps it to survive/reproduce.Thus, we can conclude that the correct option is (b).
They are separate species because they cannot successfully reproduce.
which means they have different adaptation methods.
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is the presence of industry in developing nations high? what about developed nations?
Answer:
Developing countries don't have lots of industries, so it's not high
Developed nations have a wide variety of industries
Explanation:
please help me out, name all 3 parts of the atom.
In the atom, the arrow 1 depicts the proton. The arrow 2 depicts the neutrons, and the arrow 3 depicts the electrons. All three of these are subatomic particles.
What is an atom?An atom is the fundamental structural unit of matter. It consists of protons, neutrons, and electrons. Electrons are negatively charged particles that are present outermost shell of the atom, while protons are positively charged particles that make up the core of the atom. The neutron doesn't have any charge.
Both neutrons and protons make up the core of an atom, while electrons revolve around them. A neutral atom has equal numbers of protons and electrons. Example: the sodium atom.
Hence, the atom showing arrow 1 is a proton, arrow 2 is a neutron, and arrow 3 is an electron.
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Many animals have a mutually-beneficial, symbiotic relationship with bacteria that reside in their guts. To study the effects of these relationships in more detail, research organisms such as fish and mice have been raised under germ-free conditions. What important process do you predict is compromised in germ-free mice
Answer:
Explanation:
Quá trình tiêu hoá và hấp thụ chất dinh dưỡng
If a scientific journal article is difficult to understand in its entirety, what is the best resource for comprehending the overall study
and results?
Answer:B an abstract of the study
Explanation:
