. Human activities can cause an imbalance in biogeochemical cycling and lead to problems such as cultural eutrophication and fish kills. The transfer rate, which is the amount of nutrients that moves from one component of the environment to another within a specific period, can changed by human beings. Therefore, the dynamics of the community can very well be affected.
To explain, humans can use certain nutrients for animal feed supplements, fertilizers, detergents, and the like. Eventually, these items (untreated as well as treated) will be added to nearby waters as superfluous nutrients. Swift and hasty population growth of algal occurs because of eutrophication. Furthermore, fish are killed as oxygen is consumed when the algae decay and die.

2. Opportunistic growth and equilibrium growth are each kinds of growth patterns. Both comprise of a life history, a specific mix of characteristics. Opportunistic species display exponential growth, in which the growth occurs in the identical style as compound interest. Size-wise, they are small. Opportunistic species have many offspring, but they do not provide much parental care toward them. Although they mature at an early stage, their life span is not long.
On the other hand, equilibrium species show growth that is unhurried at first, accelerates, and then slows down again, also known as logistic growth. These individuals must compete for the scarce recourses; they invest much energy to their development and existence. Hence, they are quite large. Equilibrium species provide much care for their small number of offspring. Their maturing process is slow, and their lifespan is long.