Q: How many valves are in the heart? Choices: - one - six - two - four A:
four

Q: What type of electricity is formed when a negative charge builds up and are transferred? Choices: - neutron energy - alternating current - direct current - static electricity A:
static electricity

Q: A single, often oversimplified, path through which energy and matter flow through an ecosystem is also known as what? Choices: - the chain - fuel chain - life cycle - food chain A:
food chain

Q: What is the suns innermost layer called? Choices: - surface - solar - flare - core A:
core