Biosphere

51. Which of the following is NOT an example of a keystone species?
a) Beavers
b) Sharks
c) Wolves
d) None of the above

52. What is the term for the variety of life in an ecosystem?
a) Biomass
b) Biodiversity
c) Biome
d) None of the above

53. What is the term for the largest ecosystem type?
a) Biome
b) Biosphere
c) Ecosystem
d) None of the above

54. Which of the following is NOT a threat to biodiversity?
a) Habitat destruction
b) Climate change
c) Overfishing
d) None of the above

55. Which of the following is NOT a type of natural selection?
a) Stabilizing selection
b) Directional selection
c) Disruptive selection
d) None of the above