What are four eras in the history of life on earth.

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 is the starting point in replication called

Each nephron is made up of capillaries that form the __ sweat glands bladder glomerulus ureter