Two difference between drone bee and worker bee

How does friction with the atmosphere affect the speed of an artificial satellite

Any sound above what db can cause hearing loss in human beings

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?