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Lilit [14]
3 years ago
12

PLEASE HELP!!!!

Biology
1 answer:
Rainbow [258]3 years ago
3 0

Answer:

Carbon is found in all living organisms. The constant flow of carbon on Earth through organisms and the air is known as the carbon cycle.

<u>Plants</u> absorb carbon from the atmosphere in the form of carbon dioxide.

They use it for respiration and <u>photosynthesis</u>.

Animals consume plants, transferring carbon along the food chain. Plants and animals respire and release carbon into air. When the animals and plants die, they are eaten by <u>decomposers</u>.

Carbon enters back into the atmosphere in the form of <u>carbon dioxide gas.</u>

Explanation:

All life on Earth is made up of a carbon-based structure. An atom of carbon has 6 electrons (4 valence electrons) that easily bond to other  other compounds. Covalent bonds involve exchanging electrons; these usually are formed with oxygen, nitrogen, phosphorus and most frequently hydrogen.

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Answer:

Option C, shared DNA sequences

Explanation:

Complete question -

What evidence suggests that vertebrates are more closely related to echinoderms than are any other invertebrate phyla?  

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Solution

Vertebrates have true backbone while invertebrates lack true backbone. Among the invertebrates, the echinoderm phylum is closely related to vertebrates as the echinoderm possesses notochord (similar to backbone) during their early stage development which disappears later.  

Through the genomic sequence studies it has been found that echinoderms are similar to vertebrates in many ways. Echinoderms have diverged from deuterostomes along with human and hence pose some genetic similarity  which can be devised through study of common DNA sequences

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