If you use more than one independent variable at a time, and will observe a change, you will not know which variable contributed to a changed result.
Answer:
Fossil fuels produce energy when used
Explanation:
when something combusts or is used it produces energt
Answer:
C. Organisms are capable of producing food without light.
Explanation:
this is the best answer because mostly bacteria live in the the bottom of the ocean. and they feed on dead organisms who have already harnessed the sun's light to create food.
