What type of relationship is observed between insect-pollinated plants and their pollinators?

Small fish get stuck near the bottom of a shark and derive their nutrition from it. This kind of association is called as:

Match Column $-I$ with Column $-II$ and select the correct option.

Column $-I$	Column $-II$
$(a)$ Predation	$(i) \ (-, 0)$
$(b)$ Commensalism	$(ii) \ (+, -)$
$(c)$ Mutualism	$(iii) \ (+, 0)$
$(d)$ Amensalism	$(iv) \ (+, +)$

Choose the correct statements regarding population interactions between two species.
$A$. In both parasitism and commensalism, only one species benefits and the other species is harmed.
$B$. Both species benefit in mutualism.
$C$. Both species benefit in commensalism.
$D$. In parasitism, only one species benefits and the other species is harmed.
$E$. In amensalism, one species is harmed and the other is unaffected.

Explain parasitism in detail.

'Resource partitioning' is an important mechanism which promotes