If the tubes of the tracheal system in insects were longer, this would a. allow oxygen to reach the cells faster b. slow down the rate of diffusion c. leave room for a ventilation system d. cause oxygen to reach the cells more slowly

In guinea pigs, black fur (b) is dominant over white fur (b). cross a heterozygous (hybrid) black guinea pig with a homozygous (purebred) white guinea pig. complete a punnett square, identify the genotype(s), phenotype(s), and probability (% and fraction) that the offspring will be black and white?