Q: The surfaces of the bones at the joints are covered with a smooth layer of cartilage, which reduces what force between the bones when they move? Choices: - vibration - expulsion - gravity - friction A:
friction

Q: Where does the energy from an atomic bomb come from? Choices: - isotope of atom - electron shell - neutron - nucleus of atom A:
nucleus of atom

Q: Q: Lava erupts through long cracks in the ground, also called what? Choices: - ridges - crevasses - faults - fissures A:
A: fissures

Question: Q: Is urea or salt reabsorbed faster? Choices: - same speed - neither is reabsorbed - urea - salt A:
Answer: salt

*Question*
Q: What stimulates the production of milk by the mammary glands following childbirth? Choices: - progesterone - estrogen - melanin - prolactin A:
**Answer**
prolactin

Q: Harmful instances of what can result in errors in protein sequence that yield non-functional proteins? Choices: - infection - bioaccumulation - radiation - mutation A:
mutation