Explain how the allele for sickle cell disease, which is a harmful allele when a person is homozygous, can be beneficial when a person is heterozygous.

How does global wind affect weather in the U. S.?

In cattle, coats may be solid white, solid black, or black-and-white spotted. When true-breeding solid whites are mated with true-breeding solid blacks, the F1 generation consists of all solid white individuals.

What is the overall trend in the prevalence of CVD in the U. S population?

Burning fossil fuels releases oxides of sulfur and nitrogen. these air pollutants can be responsible for question 5 options: a. precipitation with a ph as low as 3.0. b. the increase of fish populations in lakes. c.

The roots of plants take up nitrates from the soil. what are nitrates used to make? a.) starch b.) protein c.) fats d.) glucose

The front leg of an iguana and the wing of a bird look different, but both limbs likely originated from a similar limb in a shared ancestor. Structures such as these are said to be A) heterogeneous B) differentiated C) vestigial D) homologous

What's the genotype of human female

Fluid filled sacs found between the skin and underlying bony prominences are called

Trees, such as those in the deciduous forest, are very important to the environment. If the number of trees on earth continues to decrease significantly, what might be the result?

List two reasons why amphibians must live in moist environment.