Layer around Earth's surface where life can exist.
Matter and energy are exchanged between the system and its surroundings.
Energy enters or leaves but matter does not
Nonliving and never living of the environment
Living or once living.
Group of similar organisms that can breed to produce fertile offspring.
Group of organisms of the same species interacting in a particular area.
Group of interacting populations of different species in a particular area.
Community of different species interacting with each other and the abiotic parts of their environment.
All of the combined ecosystems on Earth.
Type of environment where particular organism (species) or population lives.
The role of a species in an ecosystem.
The ability of a species (population) to withstand variations in the environment conditions (Abiotic Factors).
The role of a species plays with out competition.
The role a species plays in reality with competition.
Abiotic factors that limit the growth of a population.
The number and variety of species in a biological community.
Strategies for survival.
Animals that feed on other animals.
Animals that are hunted and killed.
An animal species that holds the community together, without it the community collapses.
Competition between two species for food water and shelter.
Competition with in species for food water and shelter.
Competition for resources.
Predation, parasitism, herbivory. One of the organisms involved is the resource.
Two species cannot occupy the same niche without one species becoming extinct.
Two species use somewhat different resources.
A relationship where different populations or organisms try to use the same resource.
A relationship where two species live in close association to each other.
A relationship where an organism lives on or in another organism and feeds on it. One species benefits and the other is harmed
A relationship between two organisms where both benefit.
A relationship where one species benefits and the other is unaffected.
Changes in the inherited characteristics of a species over generations.
Pressure from the environment to give certain traits an advantage over other traits.
A characteristic that an organism can pass on to its offspring through its genes.
Differences among members of a species.
An organism's ability to survive and reproduce in a particular environment.
A change in a population that improves their potential of survival.
Strings of DNA that determine traits.
Two or more species interact closely so that one acts as a selective force to other.