Laws can be tested over and over and their results will still be the same, and laws cannot be disproved. Theories can always be disproved beause they are tested and experimented continously and results can change. Laws can't be theories but theories can be turned to laws. Hope this helps, didn't know an exact answer to that but I hope you can draw your answer from this information.
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Answer:
There is a higher oxygen content in the air of the lungs than that of oxygen-depleted blood and a lower carbon dioxide concentration. This gradient of concentration causes gas exchange during respiration.
Explanation:
The answer to this is true
answer: please refer to my word document which i wrote and attached in my answer.i hope it helps you i am so sorry if it wasnt what you wanted. PLEASE DOWNLOAD MY DOCUMENT AND OPEN IT YOU WILL FIND MY WORK .I ALSO ADDED A DIAGRAM OF THE DIGESTIVE SYSTEM TO HELP YOU UNDERSTAND MORE.
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