Why would two different species have similar features or behaviors

Adaptation and environment

Explanation:

You can have two different species that were one in the same at some point in time, but you have varying aspects such as environmental factors and natural selection.

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above

yes, because even though a theory has a  lot of evidence to support it, it is not always true