Question

the prefix \mono-\ means one. why do you think identical twins are called monozygotic?

Explanation:

Identical twins develop from a single (mono - from the prefix meaning one) zygote. A zygote is formed when a sperm fertilizes an egg. In the case of identical twins, after fertilization, the zygote splits into two separate embryos. Since they come from a single zygote, they have the same genetic material.

Answer:

Identical twins are called monozygotic because they develop from a single zygote.