Question

read the passage. then answer the question below.
in the mediterranean sea, an artificial reef is made from concrete saved from construction projects. the marine biologists who designed the reef did not want the heavy concrete to sink into soft mud. so, they put the reef in an area where the seafloor is hard and rocky.
the large concrete structure creates a habitat. clams and barnacles grow on the concrete. shrimp and crabs can hide from predators in the reef. the reef also attracts fish species such as dover sole and black scorpionfish, which eat the smaller organisms.
on an artificial reef in the mediterranean sea, the rocky bottom, the dover sole, and the shrimp make up which of the following? select all that apply.
a population
part of a community
part of an ecosystem

Explanation:

• A population is a group of the same species. Here, Dover sole, shrimp are different species, so not a population.
• A community is all the living organisms in an area. Dover sole and shrimp are living organisms, but the rocky bottom is non - living. However, when considering the options, the question is about what they "make up" in the context of the given choices. In an ecosystem (which includes both living and non - living components), they are part of it. Also, in a community (living organisms), they are part of it as they are living.

Answer:

B. part of a community, C. part of an ecosystem