1)how many years of history separate 1200 b. c. and a. d. 450?
a) 850
b) 750
c) 1650
d) 800

Would really appreciate it, i have an idea but not completely sure

The production of cells during mitosis into specialized function is recombination or differentiation

Vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a.) antibody, antibiotic b.) antigen, antibody c.)antibiotic, antibody d.)antibody, antigen