Which of the following statements is not true about ecosystems?
1. a healthy ecosystem can support an unlimited number of life forms.
2. the parts of an ecosystem depend on each other.
3. predators play a role in balancing the earth's ecosystems.
4. people's activities can improve the health of an ecosystem.

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

Which experiment would most likely contain experimental bias ?

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.