I think it’s F, c, and a.
Answer:
complement is a system of plasma protiens that can be activated directly by pathogens
Amniotic Egg - This type of egg does not require water. Organisms could lay their eggs on land they would not dehydrate.
Lungs - got to be able to extract oxygen from their environment for cellular respiration.<span />
Well oxygen has 6 electrons in its outer shell and mg has 2. Oxygen need two to complete it's outer shell and mg needs to lose 2 to gain a complete out we shell.