Q: Q: What layered form of carbon is used as a lubricant and in pencils? Choices: - carbonite - copper - lead - graphite A:
A: graphite

Q: Q: Eutrophication, or high levels of nutrients, can cause conditions that deprive fish of what vital gas? Choices: - dioxide - hydrogen - nitrogen - oxygen A:
A: oxygen

Q: Q: The different types of what systems work together to carry out all the life functions of the individual? Choices: - maturation systems - digestive systems - heartbeat systems - organ systems A:
A: organ systems

Q: Q: What organism is an important pioneer on cleared rock and soil surfaces, such as volcanic flows and burned forests? Choices: - cysts - algae - pigment - lichen A:
A: lichen