What do invasive species do when in a new area?
A. breed with existing species
B. die because they cannot survive
C. get in balance with the existing food chains
D. "take over" the area and edge out the native species

When a field is replaced by a housing development, what happens to the organisms in the area?
A. Competition for food and shelter is reduced.
B. The population declines due to less food and shelter being available
C. There is an increase in the food supply for the population
D. There is an increase in the population size.

In a forest ecosystem, the number of organisms started decreasing because land is cleared to grow crops. Which factor is responsible for the decline of animal population?
A. Lack of adequate sunlight
B. Lack of clean water
C. Lack of enough living space
D. Not a cause for concern

Rainforests have been cleared to get timber. What effect will this have on the rainforests?
A. Animals will no longer depend on plants for food
B. Animals will not survive the loss of habitat
C. Plants will grow faster as the soil will increase in fertility
D. Plants will have more space to grow

When is ecological control of invasive plant species successful?
A. It eliminates some invasive species present
B. It eliminates all species present
C. It is inexpensive
D. provides native species an edge in competing with invasive species

Habitat destruction leading to loss of biodiversity is often
A. A common natural event
B. A direct result of human activity
C. Helpful to the environment
D. Not a cause for concern