Which term describes a type of trait that is usually expressed only when an organism has two identical alleles for the trait

The answer is; homozygous

An organism can be homozygous dominant or homozygous recessive. The former means the organism has two of the dominant alleles for the trait while the latter means the organisms have two of the recessive alleles for the trait. When the organism has a dominant and recessive allele, it is referred to as heterozygous.

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation: