Nico is reading an article about two fossils that appear to have a common ancestor. fossil x has a much more complex bone structure than fossil y.

what does this most likely suggest about the fossils?
fossil x evolved later in earth's history than fossil y.
fossil x evolved earlier in earth's history than fossil y.
fossil x is less than 100,000 years old.
fossil y is more than 100,000 years old.

Ans.

According to theory of evolution, all living organisms are evolved from a common ancestor and simple life forms progressively evolved into more complex life forms. It means, evolution represents a gradual process, in which diversification of simpler organisms into complex life forms takes place.

As fossil of organism X shows a more complex bone structure than fossil of organism Y, fossil X must have evolved after fossil Y.

Thus, the correct answer is option). 'fossil X evolved later in Earth's history than fossil Y.'

it takes hundreds of years to become stable.

if you have another question lmk.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.