The thin rigid "skin" that floats atop the layer below is the crust.
True
False

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

Why has two different alleles for the same trait?

Which of th following best describes how genes produce traits in an organism?