Living organisms form communities, and we need to understand the relationships within and between these communities. These relationships are affected by external influences.
Physical factors that may affect organisms are:
■ availability of nutrients
■ amount of light
■ availability of water
■ availability of oxygen and carbon dioxide.
Quantitative data on the distribution of organisms can be obtained by:
■ random sampling with quadrats
■ sampling along a transect.
A transect is a line across a habitat…