What phrase best defines a star system? a group of hundreds of stars a group of two or more stars a group of stars that formed around the same time a group of two stars in which one star is brighter than the other

Which would happen if more forests were cut down? a. the nitrogen cycle would be stopped b. nitrogen would be fixed by bacteria more quickly c. the amount of co2 in the atmosphere would increase d. fossil fuels would build up in the soil c the amount of co2 in the atmosphere would increase