The indispensable chemical element is carbon.
Answer: Human evolution, the process by which human beings developed on Earth from now-extinct primates. Viewed biologically, we humans are Hono Sapines, a culture-bearing upright-walking species that lives on the ground and very likely first evolved in Africa about 315,000 years ago.
I'm sure it's true .because sperm particles contain 250 million particles.
If we look to the nucleus contain 1.5 million neurons.