Ecosystem Interactions Quick Check 1. When resources are stable over a long period of time, a species’ population can be expected to(1 point)

-stay the same.
-die out.
-increase.
-decrease.

2. Which factor may increase a rabbit population?(1 point)

-decrease in predators
-decrease in food
-decrease in temperature
-decrease in space

3. A group of mountain gorillas has 10 members. How big is the group after 4 females emigrate, 2 females immigrate, 2 gorillas are born, and a male dies?(1 point)

-7
-13
-9
-1

4. Predator/prey interactions regulate the populations of both groups. Which chain of events follows from an increase in predators?(1 point)

-increase in prey → decrease in predators → decrease in prey
-increase in prey → increase in predators → decrease in prey
-decrease in prey → increase in predators → decrease in prey
-decrease in prey → decrease in predators → increase in prey

5. The population change equation is Population Change = (Natality - Mortality) + (Immigration - Emigration). Which equation would create stable population?(1 point)

-natality + immigration = mortality + emigration
-natality + immigration = mortality - emigration
-natality - immigration = mortality + emigration
-natality + mortality = immigration + emigration