Study of nature's "houses," organisms that live in those "houses", and interactions based on energy and nutrients.

a group of similar organisms that can breed and produce fertile offspring.

group of individuals that belong to the same species and live in the same area.

an assemblage of different populations that live together in a defined area.

all the organisms that live in a place, together with their physical environment.

any living part of the environment with which an organism might interact.

nonliving part of the environment, such as sunlight, heat, precipitation, hum

includes all the gases that surround Earth.

consists of all Earth's fresh water and salt water, including water vapor and rain in the atmosphere, and underground water.