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

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

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 differences between organisms of different species.

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.

A group of similar organisms that can reproduce to produce FERTILE offspring

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

Give two examples of abiotic factors

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

The place where an organism lives

Competition between organisms of the SAME species e.g. for food or mates