Organic in chemistry is to have carbon. but all carbon, nitrogen, oxygen and sulfur are common atoms in organic molecules so go with D. All of the above
Overuse of pesticides result in killing of bees.
"The result of fertilization is a cell (zygote) capable of undergoing cell division to form a new individual. The fusion of two gametes initiates several reactions in the egg. ... The most important result of fertilization is egg activation, which allows the egg to undergo cell division."
The contractile vacuole expels water out of the cell by contrasting.