Question

which of the following statements best describes the relationship between the various levels of organization? a communities are made up of ecosystems, and ecosystems consist of individual organisms and populations. b individual organisms are the largest level of ecological organization, with communities consisting of multiple ecosystems. c populations are the level of ecological organization made up of communities, which are composed of individual organisms. d ecosystems are composed of communities, which are composed of populations, and populations are made up of individual organisms.

Explanation:

To determine the correct statement, we analyze the ecological levels of organization:

• The correct order from smallest to largest is: Individual organisms → Populations (groups of same - species organisms) → Communities (groups of different populations) → Ecosystems (communities + abiotic factors).
• Option A: Ecosystems include communities (not the other way around), so this is wrong.
• Option B: Ecosystems are larger than communities, and individual organisms are not the largest level, so this is wrong.
• Option C: Communities are made of populations (not the other way around), so this is wrong.
• Option D: Follows the correct order: Ecosystems (community + abiotic) → Communities (multiple populations) → Populations (multiple individuals) → Individual organisms.

Answer:

D. Ecosystems are composed of communities, which are composed of populations, and populations are made up of individual organisms.