Question: During the summer Anthony found it was way too hot to be comfortable. He went out to his garage to get an old fan. The fan was spins on a metal bearing but because it is old it was slightly rusted. When he turned the fan on it spun very slow, struggling to move. He then decided to lubricate the bearing that rotates the fan blades and the fan started spinning normally. Given a rusted machine and a freshly lubricated machine, which one will require less work to operate, the rusted one of the lubricated one?
Answer: lubricated machine

Question: Two teams studied two types of animals: team A studied predators, while team B studied grazers. They learned a lot from this experience. Which team learned about keystone species?
Answer: team A

Question: In a greenhouse, two new plants have just been planted. Flower D has come from a region of little rainfall. Flower E was taken from an area that sees rain nearly every day of the year. Which flower would be better at handling not being watered for a long period of time?
Answer:
Flower D