Question

Which of the following factors affect population size? Check all that apply.

birth rate

death rate

immigration

emigration

disease

competition and predation

human activity

natural disasters and occurrences

Answer 1

All of the factors affect population size.

Birth rate, death rate, immigration, emigration, disease, competition and predation, human activity and natural disasters and occurrences.

Population size is the total number of individual organisms in a population. A population size can be increased by birthrate (number of individuals born per 1,000 individuals per year), and immigration (movement of an individual to a new location), and it can be reduced by death rate, disease, emigration, competition and predation, and natural disasters and occurrences.

Answer 2

The factors that affect population size include birth and death rates, immigration, and emigration.

Population size

Population size is the total number of individuals of a particular species living in a particular area at a point in time.

The size of a population depends on the number of individuals exiting (E) and entering (I) the population as well as the death (D) and birth (B) rates in the population.

Mathematically;

Population growth rate = (Immigration - Emigration) + (Birth - Death)

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