What caused the Devonian mass extinction?

a meteorite

global cooling

humans

none of the above

Why best describes red blood cells

Which classification describes the milky way? irregular regular spiral barred spiral elliptical

Repeat the process again when one parent is heterozygous black and the other is homozygous brown. Genotypes: % homozygous black fur (BB) % heterozygous black fur (Bb) % homozygous brown fur (bb) Phenotypes: % black fur % brown fur

While plant and animal cells have structural similarities, they also differ in a few ways, including in shape. Plant cells tend to be rectangular and have distinct edges, while animals cells widely in shape and tend to have rounder, more fluid edges.

The concentration of na within a cell is required to be __ than the external concentration.

A virus is not considered a true living thing because it lacks one of the requirements of life. The ability to respond to stimuli The ability to reproduce The ability to grow and develop The ability to utilize a form of energy

What kinds of organisms require telomerase?

Suppose that a species of fish has split into two populations in a lake: one on the eastern side and one on the western side. How could you determine whether the two populations constitute different species? A.

Organisms interact with their environments, exchanging matter and energy. for example, plant chloroplasts convert the energy of sunlight to

What is the function on an ovary in a flower?