What is the Atretochoana also know as?

The number of living organisms in a particular area is

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

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?