*Question*
Q: Which layer of soil experiences the most weathering? Choices: - subsoil - bedrock - humus - top layer A:
**Answer**
top layer

*Question*
Q: What force opposes a motion of a moving body? for example a car breaking on a road. Choices: - tension - vibration - thermal - friction A:
**Answer**
friction

*Question*
Q: What has a pseudocoelom and hydrostatic skeleton? Choices: - vertebrates - omnivores - gymnosperms - roundworms A:
**Answer**
roundworms

*Question*
Q: Macrophages, which can swallow and destroy old and dying cells, bacteria, or viruses, are large types of what cells? Choices: - red blood cells - white brain cells - dendritic cells - white blood cells A:
**Answer**
white blood cells