Question

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?
the rabbits began to overpopulate greatly
the rabbit population declined sharply
new rabbit predators evolved
populations of animals competing with rabbits grew

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?
loss of biodiversity
global warming
loss of genetic diversity
biological magnification

Explanation:

• For the first question: In an ecosystem, when a species (rabbits here) has no natural predators and plenty of food, its population will grow rapidly. So the rabbits began to overpopulate greatly.
• For the second question: Biological magnification (also known as biomagnification) is the process where the concentration of a substance (like DDT) increases as it moves up the food chain. Loss of biodiversity refers to a decrease in the variety of species. Global warming is about climate - related temperature increases. Loss of genetic diversity is about a decrease in genetic variation within a species.

Answer:

• First question: The rabbits began to overpopulate greatly.
• Second question: Biological magnification.