The envelope of gases surrounding the earth

The regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms.

All the waters on the earth's surface, such as lakes and seas, and sometimes including water over the earth's surface, such as clouds.

The rigid outer part of the earth, consisting of the crust and upper mantle.

A nonliving condition or thing, as climate or habitat, that influences or affects an ecosystem and the organisms in it: it can determine which species of organisms will survive in a given environment. 

Any living component that affects the population of another organism, or the environmen

The ability to be maintained at a certain rate or level.

The variety of plant and animal species in an environment.

An organism that gets its energy by eating an other organism.

An organism that breaks down dead organisms and waste, returning important nutrients to the soil

An organism that makes its own food, such as plants and algae

An animal or plant on or in which a parasite or commensal organism lives.

an organism that lives in or on another organism (its host) and benefits by deriving nutrients at the host's expense.

The path of food energy from the sun to the producers to a series of consumers, in an ecosystem

a chemical process by which plants use light energy (radiant energy) to make sugar (chemical energy) from water and carbon dioxide

1. first or highest rank or importance; chief; principal 2. first in order in any series, sequence, etc

The total mass of organisms in a given area

What something is made of

something that follows an expected order or sequence, like a line.

To act on or in close relation with each other

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