The hydrosphere is composed of

a. all of the plants and animals in the water

b. all of the water and water vapor on earth

c. ice

d. air

It is B, as the hydrosphere refers to all of the Earth's water. These include: groundwater, clouds, lakes, rivers, oceans and ice.

Iam not sure but to me it with be a or dsorry if i was late! hope this ! : )if you really want me to find out the answer that is correct tell me and i will do more research but the a or d makes sense to me.