Q: You are presented with the quiz "What do trees have that insulates?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "trees have woody stems covered with bark" and "bark on mature trees runs 6 to 12 inches thick, insulating the tree against fire damage". So, what's the best answer to the question?

OPTIONS:
- hats
- looseness
- dogs
- woody stems
- food and shelter
- cells
- storing water
- In their leaves

A: woody stems

Q: You are presented with the quiz "What are used for seeing in the absence of light?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "alight bulb is used for seeing in the dark" and "just as darkness is the absence of light". So, what's the best answer to the question?

OPTIONS:
- light bulbs
- cactuses
- satellites
- microscope
- photons
- bushes
- energy
- focusing a lens

A: light bulbs

Q: You are presented with the quiz "Fish are aquatic animals that do not lack a what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "invertebrates are animals that lack a vertebral column, or backbone" and "fish are backboned aquatic animals". So, what's the best answer to the question?

OPTIONS:
- the body's largest organ
- furry hide
- vertebral column
- critical organs
- thumbs
- aqua lungs
- salt and water.
- Chlorophyll

A: vertebral column

Q: You are presented with the quiz "What creates sound waves?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "aradio converts electrical energy into vibrations" and "sound Sound waves are caused by vibrations in the air". So, what's the best answer to the question?

OPTIONS:
- a curling iron
- energy
- carpet
- animals
- dolphins
- Gunshots
- a couch
- a radio

A:
a radio