input: OPTIONS:
- giant
- white
- yellow
- blue Now, answer this question: Answer the following question given this paragraph: Stars are classified by color, which correlates with temperature. Red stars are the coolest and blue are the hottest. Q: Red stars are the coolest; which are the hottest? A:
A:
output: blue

Answer the following question given this paragraph: An element is a pure substance. It cannot be separated into any other substances. There are more than 90 different elements that occur in nature. Some are much more common than others. Hydrogen is the most common element in the universe. Oxygen is the most common element in Earth's crust. Figure below shows other examples of elements. Still others are described in the video below. Q: What element is the most common element in the universe? A:

OPTIONS:
- carbon
- helium
- nitrogen
- hydrogen

Answer: hydrogen

Problem: OPTIONS:
- Earth's surface
- Exosphere
- Troposphere
- the stratosphere
Q: Answer the following question given this paragraph: There are very few gas molecules in the mesosphere. This means that there is little matter to absorb the Sun's rays and heat the air. Most of the heat that enters the mesosphere comes from the stratosphere below. That's why the mesosphere is warmest at the bottom. Q: Most of the heat that enters the mesosphere comes from where? A:
Answer: the stratosphere

Problem:OPTIONS:
- weight
- size
- precipitation
- temperature

Answer the following question given this paragraph: Q: Each enzyme has an optimal what at which its reaction rate is greatest? A:
****
A: temperature

Answer the following question given this paragraph: The name of this molecule is 2-methylpropane. The molecular formula is still C 4 H 10 , which is the same formula as butane. A structural isomer is one of multiple molecules that have the same molecular formula, but different structural formulas. Butane and 2-methylpropane are structural isomers. Q: The molecular formula is still c 4 h 10 , which is the same formula as? A:
OPTIONS:
- chlorine
- carbon hydroxide
- propane
- butane
butane

Answer the following question given this paragraph: Radiation can be absorbed or shielded by materials, such as the lead aprons dentists drape on us when taking x rays. Lead is a particularly effective shield compared with other materials, such as plastic or air. How does the range of radiation depend on material? Ionizing radiation interacts best with charged particles in a material. Since electrons have small masses, they most readily absorb the energy of the radiation in collisions. The greater the density of a material and, in particular, the greater the density of electrons within a material, the smaller the range of radiation. Collisions Conservation of energy and momentum often results in energy transfer to a less massive object in a collision. This was discussed in detail in Work, Energy, and Energy Resources, for example. Different types of radiation have different ranges when compared at the same energy and in the same material. Alphas have the shortest range, betas penetrate farther, and gammas have the greatest range. This is directly related to charge and speed of the particle or type of radiation. At a given energy, each , , or will produce the same number of ionizations in a material (each ionization requires a certain amount of energy on average). The more readily the particle produces ionization, the more quickly it will lose its energy. The effect of charge is as follows: The has a charge of +2q e , the has a charge of q e , and the . Q: Radiation can be absorbed or shielded by materials, particularly what material used to make protective aprons worn by x-ray administrators? A:
OPTIONS:
- cotton
- steel
- carbon
- lead

Answer:
lead