External skeleton is the correct answer. Hope this helps out !
They protect bacterial cells from white blood cells.
Example: inheritances, pensions
Hope it help
4: a species is a group of interbreeding natural populations that are reproductively isolated from other such groups. Process of Speciation. The process of speciation is a 2 stage process in which reproductive isolating mechanisms arise between groups of populations.
Answer:
B I think sorry if I am wrong