An oceanographer is examing two samples of seawater that both have the exact same salinity level. however, their densities are different. sample a has a lower density than sample b , what could be the reason for samples a's lower density

Considering the answers;
a) Sample A is warmer than sample B
b) Sample A is colder than Sample B
c) There is a smaller amount of sample A than sample B in the container
d) There is a larger amount of sample A than sample B in the container
The correct answer would be A. sample A is warmer than sample B.
Ocean water or sea water gets more dense as temperature goes down. Therefore; the colder the water, the more dense it is. Increasing salinity also increases the density of sea water. Less dense water floats on top of more dense water. In this case sample A is less denser than sample B, which means it is warmer than sample B. 

The equator absorbs the most sunlight