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.within the nucleus of an atom, each proton and neutron has approximately the same mass.

Explanation:

The subject “each proton and neutron” is considered as a single entity here. According to the subject - verb agreement rule, when “each” is used with a compound subject (two or more nouns connected by “and”), the verb should be in the singular form. In this sentence, “has” is already the correct singular form of the verb “have” for the subject “each proton and neutron”.

Answer:

Within the nucleus of an atom, each proton and neutron has approximately the same mass.