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Invertebrates have no spine, and they often don't have nearly as many organs as vertebrates. Overall, they are much simpler organisms.
Answer:
B. Sequence of nucleotides in the organism's DNA
Explanation:
The genes within an organism rely on the DNA within those organisms. Different DNA create different genes.
<span>Darwin found conglomerate rocks which were important because they held Lots of shells and fossils of teeth and bones of Huge extinct mammals.
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