High concentration and passive transport
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:
A.
And
D *think this is the answer to this one
The answer is C because primary succession starts from scratch (without soil)
Answer:
True - plants are living things
