I would go for the first or the third good luck!!!
D : the number of generations in one population
Fertilizer contains different types of phosphates and nitrates. When they are used to fertilize large fields, it can be beneficial in the matter of food production. But when it rains those nitrates, phosphates, etc can run off into a river,lake,stream and cause eutrophication .
Eutrophication causes an abundance of plant growth such as algae blooms. Algae blooms can suffocate fish and can have an impact on human health.
Like all planets and most stars, the motion of the sun is directly related to the rotation of it's axis.
