Question 1:

Which of the following terms refers to the variety of different species in an ecosystem?

Explanation: Biodiversity refers to the variety of different species in an ecosystem. It encompasses the diversity of species, their genetic variation, and the variety of ecosystems they inhabit. Therefore, option C is correct.

Question 2:

Which of the following describes the role a species plays in an ecosystem, including its interactions with other species and its use of resources?

Explanation: The role a species plays in an ecosystem, including its interactions with other species and its use of resources, is described by its niche. A species' niche encompasses its habitat, its feeding habits, and its interactions with other species. Therefore, option B is correct.

Question 3:

Which of the following terms refers to the gradual change in species composition in a given area over time?

Explanation: Succession refers to the gradual change in species composition in a given area over time. It involves the colonization of new species and the replacement of existing species in a predictable sequence. Therefore, option C is correct.

Question 4:

Which of the following terms refers to the variety of different habitats within an ecosystem?

Explanation: Habitat diversity refers to the variety of different habitats within an ecosystem. It includes different physical and biological characteristics that support distinct species assemblages. Therefore, option D is correct.

Question 5:

Which of the following terms refers to the number of individuals of a species within a given area?

Explanation: Population refers to the number of individuals of a species within a given area. It focuses on the individuals of a single species and their interactions within a specific geographic location. Therefore, option B is correct.