Causes internal bleeding and eats blood.
a) pinworm
b) ascaria
c) hookworm
d)guinea worm
e) filaria
f) trichina worm

i believe the answer is a or 1

the median of the data is 4.5.

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.