Question

read the passage. then answer the question below.
tide pools on the oregon coast can experience large waves and strong currents. many tide pool organisms attach securely to the surrounding rocks to avoid being swept away.
ochre sea stars make a sticky substance to help them hold onto the rocks. pacific blue mussels glue themselves to the rocks using structures called byssal threads. a black leather chiton sticks to a rock by creating suction with its strong muscular foot. black oystercatcher birds eat mussels and chitons. these birds are strong enough to pry animals off of the rocks.
in a tide pool on the oregon coast, the pacific blue mussels, the black leather chitons, and the black oystercatchers 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, there are multiple species (Pacific blue mussels, black leather chitons, black oystercatchers), so it's not a population. A community is all the different species in an area. An ecosystem includes the community and the non - living environment. Since they are different species in a tide - pool (which has a non - living environment like rocks, water etc.), they are part of a community and an ecosystem.

Answer:

part of a community, part of an ecosystem