1. A. food B. shelter C. space D. water
61. As populations grow, they tend to spread out into new territory. Which limiting factor is MOST LIKELY to become an issue?
A. food
B. shelter
C. space
D. water

2. 62. Under which condition would a population MOST LIKELY increase?
A. The carrying capacity exceeds the habitat area.
B. The number of deaths exceeds the immigration rate.
C. The number of deaths exceeds the number of births.
D. The amount of available resources exceeds the carrying capacity.

3. 63. What will MOST LIKELY happen when the water available for a population of white-tailed deer becomes polluted?
A. The deer population will be unchanged.
B. The deer population will decease.
C. The deer population will increase.

4. 64. Which description relates to an abiotic ecosystem factor?
A. Plants growing in the environment provide a source of shelter for organisms.
B. New organisms in the environment rely on favorable weather conditions for survival.
C. Animals in the environment feed on algae and rich organic matter at the bottom of lakes.

5. A. community B. shelter C. niche D. food
65. Certain types of worms live in the mud at the bottom of a lake. What does the mud represent for the worms?
A. community
B. shelter
C. niche
D. food

6. 66. Which is an abiotic factor that would affect the growth of the population within an ecosystem?
A. Availability of water
B. availability of producers
C. type of herbivores
D. type of carnivores

7. 67. Which change would have the greatest negative impact on the survival of an owl species?
A. increase in primary consumers
B. decrease in acid rain
C. decrease in habitat size
D. increase in producers

8. A. niche B. habitat C. environment D. ecology
68. What term describes how a species meets its needs for food and shelter and how it reproduces?
A. niche
B. habitat
C. environment
D. ecology

9. 69. An aquarium containing 10 fish gains 10 more fish
69. An aquarium containing 10 fish gains 10 more fish. What is MOST LIKELY to happen to the fish?
A. They will thrive because of the additional fish.
B. They will suffer because the space is not increased.
C. They will suffer because the water will be too warm with so many fish.

10. 70. A certain species of snake consumes frogs, salamanders, and small rodents. Which change in the ecosystem will MOST LIKELY cause an increase in the snake population?
A. A new species that eats frogs enters the ecosystem.
B. The population of small rodents decreases.
C. The kinds of insects that salamanders eat increases.
D. A predator of the snake increased in number

11. A. cutting down nesting trees B. tracking nesting foxes
71. Which human activity would MOST LIKELY increase the population of nesting animals in an ecosystem?
A. cutting down nesting trees
B. tracking nesting foxes
C. adding nesting boxes

12. 72. Which BEST describes an abiotic limiting factor?
A. animals
B. plants
C. water
D. food

13. 73. When would water be a limiting factor in an ecosystem?
A. When a population is small
B. When a population is decreasing
C. When a population contains many predators
D. When a population is approaching the carrying capacity

14. A. elk B. frog C. moose D. squirrel
74. Which population would be most affected if there is a decrease in the population of aquatic insects?
A. elk
B. frog
C. moose
D. squirrel

15. A. space B. habitat C. shelter D. ecosystem
75. Which is the place where a member of the population lives and finds food?
A. space
B. habitat
C. shelter
D. ecosystem