Answer the following question given this paragraph: At the top of the troposphere is a thin layer of air called the tropopause. You can see it in Figure above . This layer acts as a barrier. It prevents cool air in the troposphere from mixing with warm air in the stratosphere. Q: What thin layer of air acts as a barrier to prevent cool air from mixing with warm air in the stratosphere? A:
OPTIONS:
- methosphere
- endosphere
- liposphere
- tropopause
tropopause

Answer the following question given this paragraph: Most chemical reactions in organisms take place in an environment that is mostly water. Q: The environment where most chemical reactions in organisms takes place consists mostly of what? A:
OPTIONS:
- air
- sodium
- helium
- water

Answer: water

Question: Answer the following question given this paragraph: Geologic maps detail the types and locations of rocks found in an area. Q: What type of maps detail detail the types and locations of rocks found in an area? A:
OPTIONS:
- contour maps
- polar maps
- gnomic maps
- geologic maps
Answer: geologic maps

input with options: Answer the following question given this paragraph: Evaporation takes place when water on Earth's surface changes to water vapor. The sun heats the water and gives water molecules enough energy to escape into the atmosphere. Most evaporation occurs from the surface of the ocean. Q: What takes place when water on earth's surface changes to water vapor? A:
OPTIONS:
- condensation
- transpiration
- absorption
- evaporation
output: evaporation

Q: Answer the following question given this paragraph: So far we have looked at ionic compounds, in which atoms of various elements gain or lose electrons to produce ions. The resulting ions are held together by strong attractions between oppositely charged particles. However, this only works for bonds between atoms in which one partner (the metal) has a tendency to lose electrons, and the other (the nonmetal) has a tendency to gain them. Then how might two nonmetals, such as nitrogen and oxygen, form chemical bonds? Neither is likely to lose electrons and become a cation, but both require more electrons to reach a noble gas configuration. Instead of a complete transfer of electrons, these atoms can bond by sharing electrons, producing what is called a covalent bond . When a group of atoms are joined together by covalent bonds, the resulting structure is called a molecule . Molecules are generally much smaller than the extended three-dimensional networks of ions that are seen in ionic compounds. We will look much more at covalent bonding and molecules in future chapters, but for now, we will focus on the ways in which molecules are named. Q: Ionic compound atoms of various elements gain or lose electrons to? A:

OPTIONS:
- become ions
- expel ions
- flatten ions
- produce ions

A: produce ions

Answer the following question given this paragraph: Clubmosses can resemble mosses; however, clubmosses have vascular tissue, while mosses do not. Q: What tissue do clubmosses have that mosses do not? A:
OPTIONS:
- dioxide tissue
- nuclei
- chorophyll
- vascular tissue
vascular tissue