If you submerge a mussel in an environment in which the ambient osmotic pressure progressively increases, the blood osmotic pressure of the mussel will
a. also progressively increase.
b. also progressively decrease.
c. increase first and then decrease.
d. decrease first and then increase.
e. not change.

The correct option is 'a'

If osmotic pressure increases when a mussel is submerged in the water,the blood osmotic  pressure also increases.

Explanation:

Mussels are bivalves that are found in fresh water as well as marine water.

They have bluish blood and small heart pumps the blood.Some mussels have red blood which contain hemoglobin that carry oxygen rather than hemocyanin.

The mussels show increase in blood chloride level and amino acid when the osmotic pressure of the water increases.

Submerging the mussel in the aquatic environment increases osmotic pressure of the mussel.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.

c. heat from the poles back down towards the equator.