Ques:Q: The strength of an acid depends on how many of which ions it produces when it dissolves in water? Choices: - silicon - carbon - helium - hydrogen A:

Ans:hydrogen
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Ques:Q: Does blood flow increase or decrease when blood vessels constrict? Choices: - it's not affected - increases - it stops - decrease A:

Ans:decrease
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Ques:Q: What makes breathing difficult due to respiratory system disease? Choices: - weak lungs - slippery air passages - water in the lungs - narrow air passages A:

Ans:narrow air passages
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Ques:Q: What do we call coiled structures made of dna and proteins? Choices: - nodes - Organisms - Molecules - chromosomes A:

Ans:
chromosomes
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