Answer:
an element is a pure substance which can not be spilt into simpler substances by chemical means
Explanation:
examples hydrogen, oxygen, copper
Answer:
Water moves in and out of cells by osmosis through the cell membrane. ... Aquaporins selectively conduct water molecules in and out of cells, while preventing the passage of ions and other solutes.
Explanation:
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Boys shoulders broaden and voice deepen, Girls start having menstrual periods and develop breast. <span />
