Q: What produces sound waves that travel outward in all directions in water? Choices: - echo chamber - ultrasound machines - amplifiers - echo sounders A:
echo sounders

(Question)
Q: What is the only substance on earth that is stable in all three states? Choices: - carbon - mercury - air - water A:
(Answer)
water

Ques: Q: What was used to measure the distance between the earth and the moon? Choices: - telescope - yardstick - ultrasound - laser beam A:
Ans: laser beam

(Q).
Q: What is the term for electric current that keeps reversing direction? Choices: - direct current - AC/DC - magnetic current - alternating current A:
(A).
alternating current

Ques:Q: The right ventricle pumps what type of blood toward the lungs? Choices: - plasma - oxygenated - oxygen-rich - oxygen-poor A:

Ans:oxygen-poor

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