There are two species of sparrows that appear very similar to each other. a scientist tried to mate them. he observed that in spite of being of the same species, they didn’t interbreed. what evolutionary force must have worked in this example?
a. migration
b. geographical isolation
c. reproductive isolation

In familial hypercholesterolemia individuals homozygous for the allele causing the disorder completely lack receptors on liver cells that take up cholesterol from the blood stream. heterozygous have one-half the number of receptors while individuals homozygous for the normal allele are phenotypically normal. this is an example of a.epistasis b.complete dominance c. incomplete dominance d. codominance

Afisherman is dragging his boat from the shore out into the ocean. match the following lists of areas he will move over in the correct order. continental rise continental slope continental shelf [tex]1.[/tex] [tex]2.[/tex] [tex]3.[/tex]

Number and variety of living organisms includes genetic, species, and ecological types