Problem: OPTIONS:
- stays the same
- increases slowly
- increases quickly
- decreases slowly
Q: Answer the following question given this paragraph: levels. If a solid has a filled valence band with a relatively low-lying empty band above it (a conduction band), then electrons can be excited by thermal energy from the filled band into the vacant band where they can then migrate through the crystal, resulting in electrical conductivity. Electrical insulators are poor conductors because their valence bands are full. Semiconductors have electrical conductivities intermediate between those of insulators and metals. The electrical conductivity of semiconductors increases rapidly with increasing temperature, whereas the electrical conductivity of metals decreases slowly with increasing temperature. The properties of semiconductors can be modified by doping, or introducing impurities. Adding an element with more valence electrons than the atoms of the host populates the conduction band, resulting in an n-type semiconductor with increased electrical conductivity. Adding an element with fewer valence electrons than the atoms of the host generates holes in the valence band, resulting in a p-type semiconductor that also exhibits increased electrical conductivity. Q: What happens to the electrical conductivity of metals when placed in a pot of boiling water? A:
Answer: decreases slowly

Problem:OPTIONS:
- power
- waves
- force
- magnitude

Answer the following question given this paragraph: Earthquake: What Does Magnitude Mean? at http://www. livescience. com/20538-earthquake-magnitude-video. html (2:00). Q: What is the strength of an earthquake called? A:
****
A: magnitude

Answer the following question given this paragraph: Mutagenesis may occur spontaneously or be induced. A spontaneous mutation can just happen. These mutations are not caused by an environmental factor, but occur during normal cellular processes. A spontaneous mutation may be due to a mistake during DNA replication or transcription. Mutations may also occur during mitosis and meiosis. A mutation caused by an environmental factor, or mutagen , is known as an induced mutation . Typical mutagens include chemicals, like those inhaled while smoking, and radiation, such as X-rays, ultraviolet light, and nuclear radiation. Table below lists some spontaneous mutations that are common. Q: Induced mutations are caused by environmental factors. what term is used to describe a mutation that has no environmental cause? A:
OPTIONS:
- cancerous mutation
- evident mutation
- numerous mutation
- spontaneous mutation
spontaneous mutation

Answer the following question given this paragraph: Q: In some species, what has led to the evolution of alternative male mating behavior and morphology? A:
OPTIONS:
- distributive selection
- similar selection
- sexual process
- sexual selection

Answer: sexual selection

Question: Answer the following question given this paragraph: Protons and neutrons are located in a central nucleus, while electrons orbit about the nucleus. Q: Where are protons and neutrons located? A:
OPTIONS:
- outside the nucleus
- secondary nucleus
- orbitals
- central nucleus
Answer: central nucleus

input: OPTIONS:
- Big Bang theory
- Geiger theory
- Pascal's hypothesis
- gaia hypothesis Now, answer this question: Answer the following question given this paragraph: The Gaia hypothesis states that the biosphere is its own living organism. The hypothesis suggests that the Earth is self-regulating and tends to achieve a stable state, known as homeostasis . For example the composition of our atmosphere stays fairly consistent, providing the ideal conditions for life. When carbon dioxide levels increase in the atmosphere, plants grow more quickly. As their growth continues, they remove more carbon dioxide from the atmosphere. In this way, the amount of carbon dioxide stays fairly constant without human intervention. Q: What is the hypothesis that states that the biosphere is its own living organism? A:
A:
output:
gaia hypothesis