Problem:OPTIONS:
- warm
- mild
- slow
- rainy
- short
- two
- unique
- cold

You are presented with the quiz "what are summer nights?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "when the seasons change from the summer to the fall , the amount of daylight will decrease" and "winter has short daylight hours and summer has short night hours". So, what's the best answer to the question?
****
A: short

Problem:OPTIONS:
- water vapor
- basic building blocks of life
- gasoline
- light and heat energy
- an electron microscope
- plasma
- heat or cold
- hydrogen and oxygen

You are presented with the quiz "What do some light bulbs convert other energy into?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "some light bulbs convert electricity into light and heat energy" and "electrical energy is also energy". So, what's the best answer to the question?
****
A: light and heat energy

Problem:OPTIONS:
- animals with backbones
- Staying away from porcupine
- Ignoring porcupine
- pressure on the skin
- Befriending porcupine
- Threatening behavior towards porcupine
- Something with a head, thorax, and abdomen
- the body's largest organ

You are presented with the quiz "What can cause predators pain?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "threatening behavior by predators causes a porcupine to extend its quills" and "porcupine quills can be extraordinarily painful". So, what's the best answer to the question?
****
A: Threatening behavior towards porcupine

Problem:OPTIONS:
- remains
- coral
- Sediment
- cellulose
- organisms
- coral reef
- cells
- Collagen

You are presented with the quiz "what are the traces of a living thing formed from?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "if fossils of an animal or plant are found in a place then that animal or plant used to live in that place" and "fossils are the remains or traces of once-living organisms". So, what's the best answer to the question?
****
A:
remains