There is external and internal so I'll list th external. The most important is skin then mucus, sweat or secretion, hair, nails and tears which are all part of the integumentary. Some internal defenses are white blood cells and T cells.
Cuz they combine during fertilization and since 2 halves = 1 whole, u get gametes w a full number of chromosomes
Precipitation and runoff, Hope this helps!
The removal of the cell membrane.
The membrane regulates homeostasis by letting "stuff" (general term) in and out of the cell.
I think c is the correct answer
