The portion of the ocean in which these organisms are most likely to be found is the:

Oceanographers classify marine organisms by separating them into two primary groups: plants and animals. Ocean Plants ... There are two general types of plants found in the ocean, those having roots that are attached to the ocean bottom and those not having roots which simply drift about with the water. 

It allows water to resist freezing and thawing cycle.

In the air and in the lower fre ah water