The differences between organisms of different species.

The place where an organism lives

A self contained area including the biotic (living) community and abiotic (non-living) components interacting with one another

Conditions in the environment that limit population size - these can be biotic or abiotic factors.

the non-living / physical part of an ecosystem that can affect population size

Two examples of biotic factors that affect the population size of an organism

When using a quadrat to estimate population size, we take many samples to ensure that our data is what?

all of the organisms of one species in an ecosystem

The range and variety of genes, species and habitats within a particular ecosystem

This describes how an organism fits into the environment. It describes what a species is like, where it occurs, how it behaves, its interactions with other species and how it responds to its environment.

the category of living factors in the environment of an organism that affect population size

A line along which organisms can be sampled in ecological studies. Particularly useful in ecosystems such as sea shores and sand dunes where abiotic conditions and species vary across the area being studied.

Give two assumptions made when using the mark, release, recapture technique to estimate population size