Which organ system makes blood cells?
a. skeletal system
b. nervous system
c. circulatory system
d. digestive system

Amutagen is 1: a living thing that has undergone a mutation. 2: an agent that causes a mutation in dna. 3: a mutation that has affected one gene. 4: a chemical that can poison living cells.

Place the steps tor the formation of the enzyme pepsinogen in correct order

Could someone me with number one you