If a keystone species is removed from an ecosystem,

a. only abiotic factors can be affected.

b. only biotic factors can be affected.

c. neither abiotic nor biotic factors can be affected.

d. abiotic and biotic factors can be affected.

What is the similarity between simple diffusion and facilitated diffusion? a. Both move molecules from lower concentration to higher concentration. b. Both move molecules from higher concentration to lower concentration. c. Both need energy. d.

The brain waves that predominate at any given time depend on a person's state of consciousness. a. True b. False

During which trimester do fingers and toes develop

If a DNA molecule is found to be composed of 40% thymine, what percentage of guanine would be expected.

Which of the following is not produced through chemical bonding? adipose (fat) tissue atoms the heart cells

Identify another invertebrate chordate other than hagfish.

If an amino acid has a side chain (r group) that is charged (i. e. bears a full + or - charge), which amino acid group would it belong in?

If an object with a mass of 100 kg on earth is taken to a planet that has more gravity, how will this affect the object's mass and weight?

Lamarck's mechanism of change can be called

What is carrying capacity and what does it mean for ecosystems?