Directional selection acts against:

both extremes simultaneously in the variation of the trait

one of the extremes in variation

the average or mean value for the population

none of these

When organisms produce more offspring than survive

When you drink sea water, what type of solution do you expose your cells to? 1. Hypertonic 2. Hypotonic 3. Isotonic

Which organ synthesizes both urea and bile

In the ecosystem of the Gazelle, select all of the abiotic factors. Question 2 options: Rocks Soil Grass Trees Air

How do nanoparticles of air pollution get into the brain?

How do prokaryotic cells get energy?

What is the genotype of a homozygous tall plant

Lupus, a condition in which the body attacks its own cells, is an example of 1-an allergic disorder. 2-an immunodeficiency disorder. 3-a cancer of the immune system. 4-an autoimmune disorder.

Relationships among Species X Y Boxing crabs gently carry anemones in their claws to sting predators and keep them away. The anemones feed off bits of food the crab drops. Fleas live on the warm body of a dog, biting the dog and eating its blood.

In a variety of cornflowers in which blue flowers and dwarf plants are controlled by dominant genes carried on separate pairs of chromosomes, and white flowers and tall plants are their recessive counterparts, assume a cross has been made between a