An ecologist wants to know if diversity in a forest system is likely to decrease when an invasive species is introduced. This invasive species is a fast-growing annual plant that grows on oak trees and kills them. The invasive species can only survive on living oak trees. The ecologist has the original model from this lab and another version of the model which includes transitions that involve the invasive species. To answer the research question, the ecologist should compare species diversity generated by the original model to diversity generated by which model described below? 1) A model in which oak has a positive transition rate to the invasive and the invasive has a positive transition to grass.
2) A model in which oak has a positive transition rate to the invasive and the invasive has a positive transition to oak.
3) A model in which the invasive has a positive transition rate to oak and oak has a positive transition to grass.

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."    

the answer is c on e2020, bud.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.