describe how non-identical twins are formed from gametes.

Explanation:

Non-identical twins form when two eggs are fertilized at the same (or nearly the same) time. ... Non-identical twins form when two eggs are fertilized at the same (or nearly the same) time. The medical term for fraternal twins is dizygotic, which means that they are formed from two separate zygotes.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;