The answer is concentration gradient. Have a good day.
Answer -
T-Cell - White blood cell = Fight off Intruders in the body
B-Cell - Macrophages = Creates Antibodies against antigen.
Cell Differentiate - Stem Cells = My favorite cell of all time in animal because they can turn into almost any cell like neural, signaling, euthyroid. Etc
I think it's <span>a=F/m ; F=m/a=1200 kg x 3.0 m/s^2 = 3600 N</span>