Q: Answer the following question given this paragraph: Graphite is a form of carbon in which carbon atoms are arranged in layers. Bonds are strong between carbon atoms within each layer but relatively weak between atoms in different layers. The weak bonds between layers allow the layers to slide over one another. This makes graphite relatively soft and slippery. It is used as a lubricant. It also makes up the "lead" in pencils. Q: What layered form of carbon is used as a lubricant and in pencils? Choices: - carbonite - copper - lead - graphite A:
A: graphite

Q: Answer the following question given this paragraph: High levels of nutrients, called eutrophication, can cause conditions that deprive fish of oxygen. 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: Answer the following question given this paragraph: Organ systems are organized into the organism. The different organ systems work together to carry out all the life functions of the individual. For example, cardiovascular and respiratory systems work together to provide the individual with oxygen and rid it of carbon dioxide. 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: Answer the following question given this paragraph: 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