Answer:
Sorry the first one I don't know.
The second one's answer is : Mature nerve cells, cardiac muscle cells, skeletal muscle fibers, fat cells, red blood cells, bone cells (osteocytes), and white blood cells (except lymphocytes) do not undergo division
Venus is called Earth's "sister planet" because it has similar size, mass, gravity and density. but the planet with the most similar atmosphere is Mars.
<u><em>Answer:</em></u>
<u><em>People have different skin colors mainly because their melanocytes produce different amount and kinds of melanin. The genetic mechanism behind human skin color is mainly regulated by the enzyme tyrosinase, which creates the color of the skin, eyes, and hair shades.</em></u>
Phosphorus, oxygen, sulfur, nitrogen, carbon, hydrogen.