Trophic Levels and Food Webs — Unit test Answers

Gross production is the amount of energy left after cellular respiration.

Populations are positively and negatively affected by a variety of biotic and abiotic factors, including the cycles of matter. Every autumn between September and November, Canadian geese will migrate from their breeding grounds in Canada to warmer Southern locations. However, in the spring between February and March, the geese will return to Canada. Photo by Peter McDermott Which abiotic factor would likely have the greatest effect on Canadian geese migration? a. fluctuations in the carbon cycle b. fluctuations in the nitrogen cycle c. fluctuations in the phosphorus cycle d. fluctuations in seasons Please select the best answer from the choices provided

Where do animals obtain carbon?a.the atmosphereb.plant and animal consumptionc.the soild.photosynthesis

Which organism gathers its energy directly from the sun?