Which of the following describes the genotype and phenotype of parents who's child will definitely have a recessive trait
a) both parents are homozygous for the recessive allele and have the trait
b) both parents are homozygous for recessive allel but do not have the trait
c) both parents are heterzygous for the recessive allel and have the trait
d) both parents are heterzygous for the recessive allel but do not have the trait

Describe the change in phase and temperature as water moves from the oceans to the atmosphere and then returns to earth again as rain. a) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature decreases b) evaporation : temperature increases; condensation : temperature decreases; precipitation (rain) : temperature increases c) evaporation : temperature decreases; condensation : temperature decreases; precipitation (rain) : temperature decreases d) evaporation : temperature increases; condensation : temperature increases; precipitation (rain) : temperature decreases

How has biodiversity on earth changed over time?

Which substance is a greenhouse gas that is emitted by human activities, is the most widespread, and remains in the air the longest?