Question

1. in the 1800s rabbits were introduced for the first time into australia. here they had no natural predators and a plentiful food supply. what happened several years after the rabbit was introduced into australia?

a. new rabbit predators evolved.
b. the rabbit population declined sharply.
c. the rabbits began to overpopulate greatly.
d. populations of animals competing with rabbits grew.

1. poisons such as ddt build up in lakes and streams due to runoff. then they enter the food chain. once in living organisms, the poisons are not broken down and their concentrations increase as they are passed along the food chain. which term best describes this ecological phenomenon?

a. global warming
b. loss of biodiversity
c. loss of genetic diversity
d. biological magnification

Explanation:

For question 7, rabbits with no natural predators and abundant food will experience population growth. For question 8, the process of poisons building - up and concentration increasing in the food - chain is biological magnification.

Answer:

1. C. The rabbits began to overpopulate greatly.
2. d. Biological magnification