Why is a shell considered to be biotic?

The term used to describe a disease-causing microorganism isa. virus.b. infection.c. pathogen.d. microbe.e. bacterium.

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000

Kudzu vines grow by climbing and wrapping around trees. trees covered by kudzu can die because they are starved of sunlight. what type of relationship exists between the trees and the kudzu growing on them?