Question

compare all the organisms. what trend do you see?the proportions of dna bases vary greatly among organisms.the proportions of dna bases are similar in closely related organisms, but different in organisms that are not closely related.the proportions of dna bases are similar among all organisms.

Explanation:

Looking at the data, for example, humans (A = 30.9, T = 29.4, G = 19.9, C = 19.8) and chickens (A = 28.8, T = 29.2, G = 20.5, C = 21.6) are more similar in base - pair proportions compared to humans and sea urchins (A = 32.8, T = 32.1, G = 17.7, C = 17.3). This shows that closely related organisms (like humans and chickens, both vertebrates) have more similar DNA base proportions, while less - related ones (e.g., human and sea urchin, different phyla) have more differences.

Answer:

The proportions of DNA bases are similar in closely related organisms, but different in organisms that are not closely related.