While standing on the beach you count 20 waves breaking in 60 seconds. What is the wave frequency? How long is the wave period? Show your calculations.

20 waves pass in 60 miutes so its going to be 45

Explanation:

The asnwer is D.

this is because the traits in all the other options are acquired traits and on this basis, we cannot classify them. Instead, we look for some deeper features like the structure of their bodies. Thus, i conclude that the  the answer is D