B, an increase in prey. More prey means more available food for predatirs
Answer:
a cell membrane is a biological membrane that separates in interior of all cells from the outside environment which protects the cell from its environment the cell membrane consists of lipid and Blair including cholesterol's and that sit between phoepholipids to maintain their fluidity at various temperatures
Explanation:
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People have grown completely immune to smallpox, meaning that the vaccine has done it's job and is no longer needed.
Answer:
Most food webs have between 4 and 5 trophic levels
Explanation:
Energy flow: From the whole quantity of energy that reaches the earth's surface, autotroph organisms or producers only absorb 0.1 or 1%.
From the input of solar energy begins a unidirectional energy flow. It passes through all the organisms in the ecosystem, from autotrophs to heterotrophs, until it is eventually dissipated in the environment.
There is an energy transfer from each trophic level to the next, and each level only uses 10% of this energy. This assessment is called "The 10% rule". As a general rule, only about 10% of the energy stored as biomass at one trophic level, per unit time, ends up as biomass at the next trophic level, in the same unit of time. The rest of the energy is used by the organisms in their own metabolism or dissipated as heat to the environment.
The progressive reduction of energy determines the number of trophic levels, which, in general, turns to be between 4 and 5.
