Q: You are presented with the quiz "Some animals communicate through what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sound can be used for communication by animals" and "snarls and barks are the sounds they make". So, what's the best answer to the question?

OPTIONS:
- chemical reaction
- eating quietly
- vibrating quickly
- being silent
- chemical changes
- hormones
- barks and snarls
- chemical messengers

A: barks and snarls

Q: You are presented with the quiz "What does chemical weathering cause iron to do?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "chemical weathering causes iron in rock to oxidize" and "when iron oxidizes, it rusts". So, what's the best answer to the question?

OPTIONS:
- rust
- vomit
- reacts
- bruise
- divide
- expand
- harm
- burned

A: rust

Q: You are presented with the quiz "Water that is not what can have a negative impact on the body?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "disease-causing microbes have a negative impact on the body" and "water was tested for the presence of disease-causing microbes". So, what's the best answer to the question?

OPTIONS:
- salinity
- chemicals
- sweat
- an object
- tested
- deadly
- dangerous
- dead

A: tested

Q: You are presented with the quiz "What do animals eat for a positive impact on their health?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "having food has a positive impact on an organism 's health" and "animals eat plants for food". So, what's the best answer to the question?

OPTIONS:
- nutrients
- plutonium
- plants
- Energy
- Proteins
- cellulose
- cyanide
- plantations

A:
plants