Q: You are presented with the quiz "What balances the soil?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "changes in the pH of soil can cause plants to die" and "compost balances the pH of soil".   So, what's the best answer to the question?

A: compost


Q: You are presented with the quiz "Bromeliads and cacti have adapted to very _ environments."   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "plants that are adapted to very dry environments are called xerophytes" and "bromeliads and cacti are xerophytes".   So, what's the best answer to the question?

A: dry


Q: You are presented with the quiz "What happens to the body without oxygen?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "brain cells die quickly if their oxygen supply is cut off" and "without proper brain functioning the body dies".   So, what's the best answer to the question?

A: dies


Q: You are presented with the quiz "What generally has a positive impact on an organism's 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 "birds and animals eat such food ".   So, what's the best answer to the question?

A:
eating