In normal humans, sex cells contain the number of chromosomes.

a: diploid

b: haploid

c: multiploid

d: tetraploid

Blood stem cells may develop into any kind of human blood cells. what kind of stem cells are blood stem cells? a. multipotent stem cells o b. totipotent stem cells o c. pluripotent stem cells o d. unipotent stem cells

The cretaceous period spanned the time interval between and 65 million years ago. 250 million 144 million 75 million 200 million

What happens to the amount of waste in the pond as the ecosystem ages?