Answer:
The respitory system and the nervous system.
Explanation:
I'm pretty sure
Explanation:
After repeated stimulation by antigen, B cells can make antibodies that bind their antigen with much higher affinity a process called affinity maturation. ... Thus, antigen stimulation greatly increases the antibody arsenal. Antibodies are proteins, and proteins are encoded by genes.
I belive its C
Explatatiom burning something is chemical and melting something is physical.
B. Cell wall because animal cell has its non-fixed shape and plant cell has fixed shape.
They have different genes.