A sandbar that completely crosses a bay, closing it off from the open ocean, is a

Number of chromosomes (not pairs)

How do we know that the horse and the donkey are not of the same species? They do not have similar morphology. They are unable to interbreed. Offspring of a horse and donkey have a unique morphology.

Explain how a zygote could end up with an extra chromosome.

In your own words, explain natural selection and include an example

ON A TIMER! A geologist finds a metamorphic rock and notices that it has grains that formed in parallel layers. The geologist pries at the rock, and it splits apart along the bands formed by the layers.

For fertilization to occur in humans, only one sperm is needed to weaken the barrier that surrounds the egg. a. True b. False

Which type of population growth quickly leads to overproduction of a species?

An individual strongly believes in Second Amendment protections. Which interest group would the individual MOST likely join? A) League of Women Voters B) Core of Racial Equality C) U. S. Chamber of Commerce D) National Rifle Association

In an experiment, a scientist studied the effect of increased levels of calcium had on a sugar levels in the blood. The scientists changed the calcium levels in people's blood and them measured their blood sugar levels.

Show the sequence of the base in your DNA molecule in the space provided below