Q: What is heard when sound waves bounce back from a surface that they can't pass through? Choices: - radio - ultrasound - loop - echo A:
echo

Q: How many bones fuse together to form the cranium? Choices: - 6 - 3 - 8 - 8 A:
8

Q: What causes reduction of elasticity in all organs? Choices: - low vitamin D - radiation - weight gain - age A:
age