Answer:
The third line of defence against pathogenic invasion is the adaptive immune response, which has two key qualities: It is specific (it can differentiate between specific microorganisms and respond accordingly) It is adaptive (it can produce a heightened response upon re-exposure - in other words, it has memory)
Explanation:
<span>A system for conducting a scientific investigation
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Answer:
I think it's b.
Explanation:
You need decomposers to return the matter back into the ground.Which the food web starts all over again.