Question

look at the text below. if there is an error with subject - verb agreement, select the incorrect verb and type it correctly. otherwise, submit the text without making any changes.
fish and young corals can discern healthy reefs from fragile ones. each of these creatures are able to detect chemical signals that help determine whether a reef is flourishing.

Explanation:

The subject "Each of these creatures" is a singular subject (since "each" refers to individual members of the group). In subject - verb agreement, a singular subject should take a singular verb. The verb "are" is plural, so it should be changed to the singular verb "is".

Answer:

The incorrect verb is "are", the correct verb is "is". The corrected sentence is: "Fish and young corals can discern healthy reefs from fragile ones. Each of these creatures is able to detect chemical signals that help determine whether a reef is flourishing."