Answer: by the y
Explanation:
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2,500 is correct in my opinion
Answer:
400
Explanation:
Because if you pull one black marble out of four and there are 100 black marbles then there is 300 others, so in total it would be 400 marbles.
thanks if i'm given brainliest!!!
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:
If a cell was to undergo all the activities, eg cell division my mitosis, it results in growth. When we were still zygotes, cell division happened by mitosis resulting in the grown ups we are now. Over division results in growth of cancer cells. And if the body exercises, Lymphocytes are produced more, resulting in more of them circulating in blood preventing disease attacks