Gentoo penguins present a potential mate with a pebble. Emperor penguins have a specific call and movement that they make to attract a mate. Which type of isolation do these penguins demonstrate?

The correct answer is - behavioral isolation.

Explanation:

Behavioral isolation is a type of isolation that take place in case of different mating behaviors development that can not be recognized or preferred by the other members of the same species or population share same environment.

The most common example of behavioral isolation is difference in matting calls of the members of the same species present in same geographic area such as Gentoo and Emperor penguins.

Thus, The correct answer is - behavioral isolation.

thinking it would be physical characteristics