A. The respiratory system takes in oxygen. The circulatory system delivers the oxygen to cells.
D it allows all substances to enter & exit the cell.
Answer:
hypothesis
A hypothesis is a possible logical answer to a scientific question, based on scientific knowledge. A prediction is a statement that tells what will happen under certain conditions. Evidence is any type of data that may either agree or disagree with a prediction, so it may either support or disprove a hypothesis.
Explanation:
Answer:
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Explanation:
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Answer:
most forms of cancer are caused by somatic mutations
Explanation:
