Plants play a crucial role in the carbon cycle because they A. Have special bacteria to live in their roots system
B. Allow carbon to enter an ecosystem through photosynthesis

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

compost can be added to topsoil as a:

pesticide