After a pathogen is ingested by a phagocyte, which even occurs first?
a. t-cell activation
b. memory cell proliferation
c. antigen presentation by the phagocyte
d. b-cell activation

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

i hope this

the answer is :