Which best describes a chemical oxidation?
the loss of electrons,
the loss of one proton,
the gain of electrons,
or reaction with oxygen gas

What effect does plate tectonics have an organic evolution

Ablastocyst is a group of cells that forms after a human egg is fertilized. the blastocyst consists of two types of cells. some of these cells will become the placenta. what do the other cells develop into?

Q: a: in sexually reproducing animals, once fertilization of the egg takes place, the exists as a single cell until cell division begins