If scientists determine the age of a rock to be three billion years old, what else do they know? a) the rock came from outside the solar system b) the rock was part of a comet c) the earth is at least three billion years old d) the earth is younger than three billion years old

How do accessory pigments chlorophyll?

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

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?