Q: Claw ends of hammers and flagpole pulleys are examples of simple machines that reverse what? Choices: - direction of power - direction of work - direction of friction - direction of force A:
direction of force

Q: Why is the drift velocity negligible? Choices: - shows free charges - less free charges - need free charges - many free charges A:
many free charges

Q: Q: What process brings nutrients from the ocean's floor to its surface? Choices: - Down welling - coastal swell - Tides - upwelling A:
A: upwelling

Question: Q: Metals, fossil fuels, and water are all examples of what type of resource? Choices: - ores - recyclables - renewable resources - natural resources A:
Answer: natural resources

*Question*
Q: Fishes were the earliest example of what subphylum, and jawless fishes were the earliest of these? Choices: - grasses - ferns - mammals - vertebrates A:
**Answer**
vertebrates

*Question*
Q: How many valves are in the heart? Choices: - one - six - two - four A:
**Answer**
four