11. Typically left off an Energy Pyramid, but has an important niche of recycling nutrients in an ecosystem are: a. producers
b. consumers
c. decomposers
d. carnivore

C decomposers

Explanation:

They are tipicallly left out of the energy pyramid but they are an important niche in order to recycle and reuse nutrance and mateirials.

answer: b (host)

viruses use the cells of living organisms to reproduce. the cell which is used by virus is called as "host cell". it is a living cell in which virus multiplies, example bacteria, plant or an animal cell.

in this, the virus is a parasite, which uses host cell for its benefit (reproduction) by using the cell machinary of host cell.