Sperm whales are found in oceans around the world and are known to have the largest brain of any organism. The head of a sperm whale takes up about one–third of its body. Another anatomical characteristic of a sperm whale are the hind leg bones circled below. In terms of evolution, which of the following statements best explains why the sperm whale has hind limb bones?

A: Ancestors of the sperm whale had hind legs to walk on land but the legs became useless when they moved to water.

B: Sperm whales began developing hind limbs to escape hunters and then hunting decreased as the population dwindled.

C: Sperm whales have legs when they are young and then they disappear since they are not needed in water.

D: Sperm whales are equipped with leg bones in case they need to move to land some day.

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

Which of these statements explains the difference between nuclear binding energy and the strong nuclear force ?

What is the relationship between wind and ocean waves? question 17 options: wind moving at higher speeds will transfer more energy to the water, resulting in stronger waves. wind moving at higher speeds will transfer energy over a larger part of the ocean water, resulting in waves with a shorter wavelength. winds moving at higher speeds with cause water to move forward at faster rates, causing larger ocean waves. winds moving at higher speeds will affect deeper water, resulting in waves that move at a faster rate. how do temperature and salinity affect deepwater currents? question 15 options: as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.