Question

seaweed belongs to which of earths spheres?
atmosphere
biosphere
geosphere
hydrosphere

Explanation:

Earth's biosphere encompasses all living organisms on the planet. Seaweed is a living marine plant, so it falls within the biosphere. The atmosphere is the layer of gases, the geosphere is the solid Earth, and the hydrosphere is all water bodies, none of which are defined by living organisms.

Answer:

biosphere