Which idea is expressed correctly?

a. annual winter break
b. annual winter break

Does anyone know the answers to these two? i don’t want to have to guess, you!

Which sentence about subject-verb agreement is not true? a. singular subjects go with singular verbs. b. plural subjects go with plural verbs. c. when the subject and the verb go together, they agree. d. plural verbs go with singular subjects.

What is a mechanism by which organisms maintain homeostasis when the level of one substance influences the level of another substance or the activity of an organ.