If 90 ants are found in a field with a total area of 100 m. what is the population density of the ants?

The complex relationship between the members of a community and their physical environment is known as________

The specific role of a species within íts environment is known as its_________

Which of the following soil fertility improvement methods will have the most negative effect on the ecosystem if not controlled?

Organisms in an ecosystem are usually grouped according to their trophic level into__________