Which of the following is an example of homoplasy?

a. Hox genes in humans and sea stars

b. streamlined bodies in dolphins and ichthyosaurs

c. astragalus ankle bones in camel and pig

d. hair in humans and fur in bear

The correct answer is option b. "streamlined bodies in dolphins and ichthyosaurs".

Explanation:

An homoplasy is defined as a trait that is shared between two different species but that they do not originate from a common ancestor. An example of homoplasy is the streamlined bodies in dolphins and ichthyosaurs. Ichthyosaurs were reptiles, not mammals like modern dolphins, therefore their similar streamlined bodies evolved separately.