Which of the following can be used by scientists to date the sediment layer they are found in? select all that apply. a) fossils b) tree rings c) animal growth rings d) radioactive isotopes e) mineral elements

What is the name for a substance formed in a chemical reaction

Adoctor is trying to diagnose a patient with dry skin. which of the following resources would be the most ? a magazine ad about soft skin a growth chart online articles about dry skin medical books

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?