Answer the following question given this paragraph: Friction is the force that resists motion. In most beginning physics classes, friction is ignored. Concepts can be understood and calculations made assuming friction to be nonexistent. Whenever physics intersects with the real world, however, friction must be taken into account. Friction exists between two touching surfaces because even the smoothest looking surface is quite rough on a microscopic scale. Q: What type of force exists between two touching surfaces? A:
OPTIONS:
- opposing
- centrifugal
- tension
- friction
friction

Answer the following question given this paragraph: Types of compounds include covalent and ionic compounds. They differ in the nature of the bonds that hold their atoms or ions together. Q: Types of compounds include covalent and which other compounds? A:
OPTIONS:
- reactant
- soluble
- solvent
- ionic

Answer: ionic

Question: Answer the following question given this paragraph: Plant-like protists are autotrophs, meaning they make their own food. Q: Plant-like protists are autotrophs, meaning they make their own what? A:
OPTIONS:
- spores
- flowers
- molds
- food
Answer: food

input with options: Answer the following question given this paragraph: In the predator-prey example, one factor limits the growth of the other factor. As the prey population deceases, the predator population is begins to decrease as well. The prey population is a limiting factor. A limiting factor limits the growth or development of an organism, population, or process. Q: What is the term for something that limits the growth or development of an organism, population, or process? A:
OPTIONS:
- controlling factor
- stumbling block
- variable
- limiting factor
output: limiting factor

Q: Answer the following question given this paragraph: Water becomes more dense when it is colder and when it has more salt. In the North Atlantic Ocean, cold winds chill the water at the surface. Sea ice grows in this cold water, but ice is created from fresh water. The salt is left behind in the seawater. This cold, salty water is very dense, so it sinks to the bottom of the North Atlantic. Downwelling can take place in other places where surface water becomes very dense (see Figure below ). Q: What is the name for the sinking of the dense, salty seawater in cold climates? A:

OPTIONS:
- cyclones
- jet stream
- tidal activity
- downwelling

A: downwelling

Answer the following question given this paragraph: The epidermis of the leaf consists of a single layer of tightly-packed dermal cells. They secrete waxy cuticle to prevent evaporation of water from the leaf. The epidermis has tiny pores called stomata (singular, stoma) that control transpiration and gas exchange with the air. Figure below explains how stomata carry out this vital function. Q: The epidermis of the leaf consists of a single layer of which cells? A:
OPTIONS:
- endothermic cells
- insular cells
- chloroplasm
- dermal cells
dermal cells