Read the passage below and choose the right answer to the following question (choices are greater or smaller ): To reduce friction, oil is added to the engine. Dana wants things to stay put easily with the help of a lot of friction, so she uses oil in amounts that are greater or smaller?
smaller

Read the passage below and choose the right answer to the following question (choices are high or low ): At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react. Mike is watching how particles of reactants function, and sees that they are very far apart. Considering that the concentration of them is very low, the chance of them colliding together is high or low?
low

Q: Read the passage below and choose the right answer to the following question (choices are greater or lesser ): When the heart expels more blood with each stroke, the heart has to beat less often in order to maintain the same volume of blood flow. Jan had a very low heart rate, but was perfectly healthy, indicating that her heart expels blood in amounts that are greater or lesser?
A: greater

Question: Read the passage below and choose the right answer to the following question (choices are more prevalent or less prevalent ): Pigments in the skin act like a filter that can prevent the skin from making vitamin D. As a result, people with darker skin need more time in the sun than people with lighter skin to make the same amount of vitamin D. Caucasian Americans have lighter skin than other Americans. Researchers were not surprised to discover therefore, that vitamin D insufficiency among Caucasian Americans is more prevalent or less prevalent than among other Americans?
Answer: less prevalent

*Question*
Read the passage below and choose the right answer to the following question (choices are more or less ): Bigger atoms have more electrons. Mona is comparing the size of two atoms in her science lab. If she notices that one atom is larger then the other, what does that tell her about the number of electrons it has more or less?
**Answer**
more

Q: Read the passage below and choose the right answer to the following question (choices are larger or smaller ): Therefore, increasing the surface area of solid reactants increases the reaction rate. Katie is looking at solid reactants, and is wondering how they will react. The reaction rate is increased in surface areas which are larger or smaller?
A: larger