Which of the reproductive isolating mechanisms given below is postzygotic?

a(hybrids form but are sterile.
b(the mating season is different.
c(flowers are pollinated by different insects.

What is the main reason that attitudes are more often revealed in spoken rather than written language? a. in writing, we try to put the "best face" on what we write. b. we speak far more often than we write. c. in writing, we can more easily conceal our attitudes. d. in spoken language, we are often careless in our use of words.

What type of cell undergoes meiosis

One brief stimulus of a skeletal muscle may result in a single isolated contractile event, which is called a twitch. one twitch can generate max tension in a muscle. are these statements true or false?