Why do a chicken embryo and a cow embryo look very similar even though the adults do not

Embryonic development is the initial stage in organism's  life. Many animal and birds species shows similar embryonic growth. This indicates that they are evolved from a common ancestor. Differences in features and structures in adulthood is because of genetic information present in the embryo and the process of subsequent adaptations for the purpose of evolution.

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