Which is a cost that comes with using coal as an energy source? a. coal will stay plentiful in the united states. b. when burned, coal produces pollutants that are released into the air. c. mining coal improves the environment. d. coal produces less energy than most other energy resources.

Ascientist wants to determine the effect of a new type of gasoline. he fillsone car with normal gasoline and another identical car with the new gasoline.which is the control group? a. the new type of gasolineb. the car with the normal gasolinec. the car with the new gasolinethe amount of gasoline usedd. the amount of gasoline used

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

Biology ! the conversion of inorganic carbon to organic carbon by plants during photosynthesis is known as _[blank]_. filtration immigration reabsorption primary production