How does this thing work Step by Step

After fertilization, which type of cellular division is responsible for the growth and development of a complex, multicellular organism?

Guinea pig coat color is determined by a single gene. the allele for black coat color is dominant to brown. in a cross between twoblack-haired guinea pigs, 20 offspring are born. if both parents were heterozygous, probability would predict that approximately howmany of the 20 offspring would have brown hair?

What are some natural processes that represent physical and chemical changes?