Q: You are presented with the quiz "Frogs have a _-chambered heart." But you don't know the answer, so you turn to your teacher to ask for hints. He says that "amphibians have a relatively complex circulatory system with a three-chambered heart" and "all frogs are amphibians". So, what's the best answer to the question? | OPTIONS:
- alveoli
- organ
- ovaries
- oxygen
- edible
- three
- nektar
- CO 2
A: three

Q: You are presented with the quiz "What is required for plant reproduction?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "plant reproduction often requires pollen" and "hay fever or pollen allergy is the most prevalent allergy". So, what's the best answer to the question? | OPTIONS:
- By wind and rain
- Something that is found on a cloud
- fertilization occurs
- Males and females
- Something that comes from a volcano
- Something that is invisible
- Something that causes allergies
- sperm and egg fuse
A: Something that causes allergies

Q: You are presented with the quiz "What has a negative impact on the environment?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "landfills have a negative impact on the environment" and "solid waste is stored in landfills". So, what's the best answer to the question? | OPTIONS:
- cigarettes
- animals
- deforestation
- rain
- wind
- Pesticides
- Pollution
- solid waste
A: solid waste

Q: You are presented with the quiz "What do genes do to form a chain?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "genes that are located on the same chromosome are called linked genes" and "thousands of genes are linked together in a chain to form chromosomes". So, what's the best answer to the question? | OPTIONS:
- interact
- spread flower seeds
- Break apart
- Link together
- reproduce
- Duplicate
- Break down
- It expands
A: Link together