Answer:
The answer is A, open systems!!
Explanation:
all systems on earth are open, except for the earth itself.
Pathogen
antigen
antibodies
foreign
histocompatability
presenting
leukocyte
Absorb and transport solar energy
Answer:
the correct example is liver cell.
Explanation:
A somatic cell can be any kind of cell except the sexual ones (sperm and eggs)
Answer:
It shoud be the second choice
Explanation:
T-T
