Different levels of in human skin have been selected for based upon a need to protect , a key nutrient for reproductive health, from harm caused by radiation.

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?

Which two criteria must be met before scientist can use radiocarbon dating? explain your answer

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic