Final answer:
Population refers to a group of individuals of the same species living in a specific area and occupying the same habitat at the same time. Two factors that can increase a population are high birth rates and immigration, while two factors that can decrease a population are high death rates and emigration.
Step-by-step explanation:
Population refers to a group of individuals of the same species living in a specific area and occupying the same habitat at the same time. Two factors that can increase a population are high birth rates and immigration. For example, when more individuals are born and when individuals from other areas move into a specific location, the population grows.
Two factors that can decrease a population are high death rates and emigration. For instance, when more individuals die or when individuals leave a specific location and move elsewhere, the population decreases.