Why is biomass a better alternative to natural gas?
a. biomass does not need to be burned.
b. biomass creates radioactive waste.
c. biomass takes less time to form.
d. biomass does not release carbon dioxide.

4. if a cell is placed inside a solution that has a higher concentration of solute than on the inside of the cell, what can be said about the movement of water? a. water will move out of the cell, causing it to shrivel. b. water will move in and out of the cell at the same rate. c. water will move out of the cell, causing it to swell. d. water will move into the cell, causing it to swell.

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

Which of the following is the scientific term for an organism that makes its food from inorganic materials? a. autotroph b. heterotroph c. embryotroph