According to the Khan Academy video: Mitosis vs. Meiosis, what is the main purpose for both mitosis and meiosis? a. mitosis produces haploid somatic cells and meiosis produces diploid gametes.
b. mitosis produces haploid gametes while meiosis produces diploid somatic cells.
c. mitosis produces diploid somatic cells while meiosis produces haploid gametes. d. mitosis produces diploid gametes while meiosis produces haploid somatic cells.

c.mitosis produces diploid somatic cells while meiosis produces haploid gametes.

Explanation:

mitosis helps replace damaged body cells while meiosis creates sex cells to maintain genetic variation

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

i'd say that the moon rock is about 2.2 billion years old.