seaweed belongs to which of earths spheres?\no atmosphere\no biosphere\no geosphere\no hydrosphere

Brief Explanations:

The biosphere encompasses all living organisms on Earth. Seaweed is a living organism, so it belongs to the biosphere. The atmosphere is the layer of gases around the Earth, the geosphere is the solid - Earth part, and the hydrosphere is the water part of the Earth. But seaweed is living, thus biosphere.

Answer:

biosphere