Which of the following scenarios is representative of parasitism? a.
Tapeworms living in a mammal’s intestinal tract
b.
Remora fish attaching themselves to sharks
c.
Birds feeding on insects stirred up by grazing animals
d.
Birds eating scraps of food from a crocodile’s teeth

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.