Problem:OPTIONS:
- protect them
- form sand
- form plants
- It expands
- form snow
- form fossils
- Metling snow
- watershred

You are presented with the quiz "What does weathering do?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sediment is formed by weathering" and "sand and mud are examples of sediments". So, what's the best answer to the question?
****
A: form sand

Problem:OPTIONS:
- cleaning
- fuel
- cooking
- food
- cooling
- warmth
- magnetisation
- energy

You are presented with the quiz "what can wood be burned for?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "burning wood is used to produce heat" and "wood stoves for cooking and heating". So, what's the best answer to the question?
****
A: cooking

Problem:OPTIONS:
- neurons
- Frogs.
- tube
- Frogs
- fluid
- fibers
- energy
- motors

You are presented with the quiz "what in the inner ear is used for sensing sound by animals?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "hearing is used for sensing sound by animals" and "for example, hearing waves are transmitted by fluid in the inner ear". So, what's the best answer to the question?
****
A: fluid

Problem:OPTIONS:
- h2o
- pollen
- sperm
- Energy.
- competition
- pregnancy
- allow growth
- death

You are presented with the quiz "what occurs when sperm swims to an egg inside an archegonium>" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fertilization occurs when sperm swim to an egg inside an archegonium" and "if the egg is fertilized, it can implant in the uterus and cause pregnancy". So, what's the best answer to the question?
****
A:
pregnancy