True or false? silicate makes up over 90 percent of earths crust?

Wht happens as electrons in the electron transport chain release their energy

Will mark brainliest if correct/available! which of the following statements is true? all plants need flowers to sexually reproduce. sexually reproduced offspring are identical to their parents. fertilization always occurs inside the female's body. a body cell has twice the number of chromosomes as an egg cell.

What is thought to have caused the mass extinction at the end of the cretaceous period?