Why do some species employ both mitosis and meiosis, whereas other species use only mitosis?
a) they need meiosis if the cells are producing organs such as ovaries.
b) a single-celled organism only needs mitosis.
c) they need only mitosis to make large numbers of cells such as sperm.
d) they need only meiosis if they produce egg cells.
e) they need both if they are producing animal gametes.