Why is genetic variation necessary for natural selection to occur?

When the animal cells undergo cell division, several cellular structures aid the movement of chromosomes into the two new daughter cells. What are these cellular structures?

Which of the following food chains is in the correct order?

Does cell growth occur in interphase or mitosis?

In a family, the father is affected by a genetic disorder. The son in the family has the same disease, but the daughters don't have it. What type of inheritance is this? A.) Y-linked B.) X-linked C.) polygenic D.) codominant

what is a process that involves the collection of information and ideas supported by belief or opinion.

Nitrogen in organic fertilizers is released slowly into the soil because the organic material has to be ...

Which is the only mechanism that can introduce new alleles in a gene pool? A. Genetic drift. B. random mating. C. mutation

Ln mammalian cells, the synthesis of fatty acids is catalyzed by a multifunctional protein named: a) Acetyl CoA Carboxylase b) Carnitine acyltransferase c) Fatty acid synthase d) B-ketoacyl synthetase e) Acyl carrier protein

How does the energy available to organisms change within each feeding level of the pyramid? A. There is more energy available in the middle levels than in either the top or bottom level. B.

What types of environment do arthropods live in