What do living organisms form?

What do changes in the environment affect?

What are the environmental factors that may affect organisms?

How can living organisms be used as indicators of environmental change?

Which environmental changes can be measured using non-living indicators?

What are the advantages of using equipment to measure oxygen levels, temperature and rainfall?

What are the disadvantages of using equipment to measure oxygen levels, temperature and rainfall?

How can quantitative data on the distribution of organisms be obtained?

What is size of distribution related to?