A group of individuals of the same species living in the same area at the same time

An organism that gains energy by breaking down dead plants an animals

The biological and physical role or job of an organism in its environment

The chemical cycle that involves nitrogen fixation and denitrification

A biome characterized by a warm climate and large amounts of rain and sunlight

Different groups of species interacting and living in the same area

An organism that gains energy by eating both plants and animals

Interaction in which one organism kills and consumes another organism

The chemical cycle that involves evaporation, transpiration, condensation, and precipitation

A biome that receives less than 25 cm of rainfall each year, has warm temperatures during the day and cold temperatures at night, and has nutrient-poor soil

An area on land that shares a similar climate, precipitation levels, soil condition, and dominant type of vegetation.

An organism that consumes other plants or animals to obtain energy

A relationship in which two or more organisms live together and both organisms benefit

The chemical cycle that involves photosynthesis, respiration, decomposition and combustion

A biome characterized by trees that lose their leaves in the fall, nutrient-rich soil, and year-round precipitation

All of the biotic species in an area interacting with abiotic environment

The interconnected feeding relationships among organisms in an ecosystem

A relationship in which one organism lives in or on another organism and harms it by taking nutrients from it

The chemical cycle that involves a chemical that is released gradually from rock and is needed to make DNA and RNA

A biome characterized by coniferous trees, long, cold winters, and summers that allow the ground to thaw

The broadest level of organization that extends from Earth's atmosphere to below the ocean floor

A diagram that demonstrates the amount of energy in each trophic level

A relationship in which one organism benefits from another organism and that organism is neither harmed nor helped

The process by which chemicals, elements, and matter are cycled between organisms and parts of the biosphere

A biome that receives too little rain to support trees and is dominated by grass species growing in nutrient-rich soil