What is a ecosystem
a. all of the organisms of a single species that live and interact in an area
b. all the organisms of a single species and nonliving things they need
c. all the living and nonliving things that interact in an area
d. all the living things that interact in an area

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

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun