Question: Q: What do all sound waves begin with? Choices: - oscillating matter - talking matter - enclosing matter - vibrating matter A:
Answer: vibrating matter

Question: Q: Calculations are described showing conversions between molar mass and what for gases? Choices: - volume - length - weight - density A:
Answer: density

Question: Q: What is the main organ required for respiration in mammals? Choices: - the diaphragm - the heart - the brain - the lungs A:
Answer:
the lungs