Q: What is the minimum number of pulleys needed for a compound pulley? Choices: - 1 - 4 - zero - 2 A:
2

Q: The waves on the strings of musical instruments are transverseso are electromagnetic waves, such as visible light. sound waves in air and water are this? Choices: - symmetrical - hydroelectric - horizontal - longitudinal A:
longitudinal

Q: Q: What form do biofuels take that makes them very useful? Choices: - crystals - solid - chemical - liquid A:
A: liquid

Question: Q: What type of oil is being explored to replace petroleum products in lubricants? Choices: - essential oil - diesel - whale oil - vegetable A:
Answer: vegetable

*Question*
Q: What do sharks use to secrete salt to assist in osmoregulation? Choices: - ceramic gland - bladder gland - blood gland - rectal gland A:
**Answer**
rectal gland

Q: Scientists perform experiments to test their hypotheses because sometimes the nature of natural universe is what? Choices: - become obvious - very obvious - this obvious - not obvious A:
not obvious