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1. The first question is about change over time.

Well, the big bang theory is a single event, so that doesn't show change over time.

The existence of homologous structures? Homologous structures are structures found in different animals, but have similar functions, such as the tailbone in humans and tails in rats. This could be the answer.

Similarities in body systems show nothing about life changes over time.

The time period in which an embryo develops only talks about that certain time period, not a long time.

Therefore, the answer is B. the existence of homologous structures.

2. Embryological evidence is evidence that shows up in the embryo. Therefore, we can immediately cut out all answers except for B. some animals exhibit similar stages in embryonic development. This is because over time, life might change, but having similar stages in embryo stages show that they started out the same, then drifted apart.

3. The answer is B. They are evidence that all came from a common ancestor that life changed over time. Homologous structures, like I explained above, are like similar structures, but they may have different structures. Basically, it suggests that these organisms came from a common ancestor that had the structure, and it changed over time for all these organisms to be able to exist in their niche.

4. The answer is C. These illustrations show the homologous forelimbs of four different species with enough similarities to suggest they all had a common ancestor. I, again, explained homologous structures above. It shows that although we started out from a common ancestor with that structure that is now homologous, life changed over time so that the structure can be used in one way in the bat, for example, versus it's function in humans.

not only is it colder, it also becomes darker, less salty, and more dense.