Answer:
A. is repeated many times to ensure that the results are accurate
Explanation:
A controlled experiment is repeated many times to ensure that the results are accurate
Respiration is a vital process for both plants and animal because through this process, oxygen is inhaled. ... Plants and animals need continuous supply of energy to perform the vital functions necessary for their survival. So, respiration is a continuous process which make an organism able to meet its energy demand.
https://www.meritnation.com/ask-answer/question/respiration-is-a-vital-process-explain/life-processes/9208881
All object in motion will stay in motion unless acted upon by an external force. This means whenever something is moving then something else has to stop it. If an object is not moving then it will stay not moving until something forces it to move.
