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amm1812
3 years ago
12

Which was the original source of atmospheric oxygen? Question 4 options: autotrophs cooling of Earth’s crust formation of the oc

eans volcanoes
Biology
1 answer:
Nuetrik [128]3 years ago
5 0

Answer:

The answer is autotrophs

Explanation:

During the early days of the Earths life there was no oxygen but there was plenty of CO2 which the autotrophs took and used as food while discarding the excess which was the oxygen.

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Why can't animals survive more than a few days without water
Arada [10]

Nocturunal animals can survive without water because they can avoid the heat of the day ...ground water cause its supplies house holds and it provides drinking water and watering plants

5 0
3 years ago
A flattened membrane sac inside the chloroplast used to convert light energy into chemical energy
algol [13]

Answer: D: Thylakoids

Explanation:

Thylakoids - A flattened, membranous sac inside a chloroplast. They often exist in stacks called grana that are interconnected; their membranes contain molecular "machinery" used to convert light energy to chemical energy.

***If you found my answer helpful, please give me the brainliest, please give a nice rating, and the thanks ( heart icon :) ***

6 0
3 years ago
Derived from a 6 membered ring. Contains Cytosine, Thymine, and Uracil.
dybincka [34]

Answer:

b. Nucleotides  

Explanation:

Nucleic acids are examples of structures formed from nucleotides. And in relation to the composition of DNA, we have the formation of the largest cellular macromolecule, all formed by nucleotides.

The nucleotide is a group formed by the association of 3 molecules - a nitrogen base, a phosphate group and a pentose glycide. Thus, we may have variations within these ligands, such as: in DNA we have the presence of pentose deoxyribose, while in RNA we have the presence of pentose ribose.

The nucleotides have differences in relation to its nitrogen base, which can be purine or pyrimidine. Purine bases vary in Adenine and Guanine, while pyrimidine bases are classified in Thymine, Uracil and Cytosine. Purine and pyrimidine bases are complementary and each have specific binders. Thus, we have that the purine base Adenina, binds with the pyrimidine bases Timina and Uracila, while the base Guanina binds exclusively to Cytosine and vice versa.

5 0
3 years ago
The branch of biology known as evolutionary-developmental biology is the study of:_______.
neonofarm [45]

Answer:

B) how changes in development underpin the evolution of  morphology.

Explanation:

Evolutionary developmental biology is the new field of research in biology which studies the combined relationship of the evolution and the developmental processes.

This interdisciplinary study compares the developmental biology in terms of evolution or in a way that how the developmental biology process evolved in the organism on the basis of studying the phenotypic features of the organisms.

Thus, Option-B is the correct answer.

4 0
3 years ago
Which is not a topic of biology?
andre [41]
A. the distribution of sand on an ocean floor
3 0
3 years ago
Read 2 more answers
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