Which substance is a good natural resource because it is used by plants and in fertilizer, and sometimes can be used to keep things really cold? A. silicon B. oxygen C. krypton D. nitrogen

What hormone does the parathyroid gland produce?

Why is the upwelling of cold water so vital for the Peruvian fish industry?

The property of metals to be made into wire is called what?

Which statement describes the light reaction of photosynthesis? A. Water molecules are combined to make food. B. Air and water create energy for a plant. C. Carbon dioxide is put together with glucose. D. Water molecules are split apart.

Which term best describes the difference in colors of the birds below? O natural selection o reproductive maturity constir unnin Mark this and return Save and Exit Next Subinit

What do amoeba proteus, dinoflagellate, and euglena viridis have in common? a. they all can move and make their own food b. they all can move and use eye spot to locate food c. they all can move and be heterotrophic d.

How is a scientific hypothesis best evaluated?

The overall population of a species decreased. What could have occurred to make this happen? The immigration rate increased, while the death rate decreased. The birth rate decreased, while the death rate increased.

Which of the following terrestrial biomes cannot be found in the United States? A: temperature deciduous forest B: tundra C: desert D: grassland/prairie

Which of these food sources does the bald eagle not feed on? plants fish carrion mammals