Q: Which situation is an example of a feedback system in the body that maintains homeostasis?

OPTIONS:
- a mouse pushing a lever to release food
- a dog going to a food bowl when a bell rings
- students receiving star stickers for good behavior
- the brain signaling blood vessels to return to normal
A: the brain signaling blood vessels to return to normal
Q: After playing outside on a cold day, Jaime went inside to wash his hands. Although the water was normal temperature, he noticed that it felt warmer than usual. What would explain this phenomenon?

OPTIONS:
- His body had more kinetic energy than the water.
- Heat flowed from a cooler substance to a warmer substance.
- The water from the faucet had a higher temperature than his skin.
- The thermal energy in the room was higher than the thermal energy outside.
A: The water from the faucet had a higher temperature than his skin.
Q: Which of these causes the atmosphere to change?

OPTIONS:
- increased inorganic matter in soil
- increased use of fertilizers on crops
- increased buildup of greenhouse gases
- increased rainfall rates near power plants
A: increased buildup of greenhouse gases
Q: Green plants get the energy they need to make food from

OPTIONS:
- air
- sunlight
- water
- soil
A:
sunlight