I only know 2 and 3 are correct. I’m not sure about the last one.
Because of the fact that female mammals have chromosomes from both parents (from the father and from the mother) and all cells have the same inactivated X chromosome female mammals are considered to be mosaic <span>of the maternal and paternal cells.</span>
That they don't have a nucleus.
Answer:
Definition. (1) The combination of oxygen with a substance forming oxide. (2) A chemical reaction in which there is the loss of electrons or gain (or increase in the proportion) of oxygen, hence, resulting in an increase in oxidation state by a molecule, atom or ion.
