You are presented with the quiz "What has primary and secondary meristems for growth in length and width?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "roots have primary and secondary meristems for growth in length and width" and "most plants have roots ". So, what's the best answer to the question?

OPTIONS:
- swamp vegetation
- rocks
- epidermal
- Conifers
- peachleaf willow
- the Moon
- most plants
- leaves

Answer: most plants

You are presented with the quiz "what is used to produce electricity by burning in power stations?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "coal is used to produce electricity by burning in coal-fire power stations" and "swamp vegetation was compressed to form coal". So, what's the best answer to the question?

OPTIONS:
- dried mud
- small animals
- heat energy
- chemical reaction
- carbon dioxide
- swamp air
- hydrogen and oxygen
- swamp vegetation

Answer: swamp vegetation

You are presented with the quiz "Harming an animal species has a what on the size of a group of individuals of that species?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "harming an animal species has a negative impact on the population size of that species" and "populations are groups of individuals of the same species". So, what's the best answer to the question?

OPTIONS:
- Abnormal cell growth
- uncontrolled
- net growth
- positive effect
- massive damage
- negative impact
- non-negative impact
- major threat to health

Answer: negative impact

You are presented with the quiz "Blowing what into a whistle causes sound?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "blowing air into a whistle causes air to vibrate inside the whistle" and "sounds are caused by vibrations in the air". So, what's the best answer to the question?

OPTIONS:
- a lack of noise
- CFCs
- CO 2
- a lack of sound
- wind
- air
- gas
- no noise

Answer:
air