Question

read the paragraph. then, add the best topic sentence.
wrinkles on wet skin could have helped early humans collect food from wet places, like streams. wrinkles on wet fingers could have helped them hold on to slippery objects better. and wrinkles on toes could have helped our ancestors’ bare feet grip smooth, wet surfaces, similar to how tire ridges help tires grip slippery roads.
animals, plants, and humans all adapt to their environments in many different ways.
the wrinkles that appear on our wet fingers and toes may have been useful to our ancestors.
wrinkles that appear on our wet fingers make it easier for us to pick things up.

Explanation:

The paragraph is about how wrinkles on wet skin (specifically fingers, toes) help humans (and by extension, the idea of adaptation in general for organisms) adapt to grip or interact with wet/slippery environments. The sentence "Animals, plants, and humans all adapt to their environments in many different ways." serves as a good topic sentence as it introduces the broader concept of adaptation, under which the specific example of human skin wrinkles (and how they help in adaptation) falls. It sets the stage for the subsequent details about how human wrinkles aid in gripping, etc., by framing it within the larger theme of organismal adaptation.

Answer:

Animals, plants, and humans all adapt to their environments in many different ways.