Question: Choose your answer.

Students dropped different rocks into sand to simulate meteorite impacts. Their goal was to determine which rock made the deepest crater. Which variable should the students control in order to have the most accurate results?

OPTIONS:
- the height from which the rocks are dropped
- the average time it takes the rocks to fall
- the density of the rocks
- the mass of the rocks
My Answer: the height from which the rocks are dropped

Question: Choose your answer.

Which describes the role of sexual reproduction in plants and animals?

OPTIONS:
- keeps all organisms looking similar
- ensures the continuation of the species
- produces offspring that are identical to the parents
- increases the size of any population over a long period of time
My Answer: ensures the continuation of the species

Question: Choose your answer.

How can you make liquid water become solid?

OPTIONS:
- Put the water in a very cold place.
- Heat the water on the stove.
- Shake the water container very fast.
- Add a lot of salt to the water.
My Answer: Put the water in a very cold place.

Question: Choose your answer.

A medical research team is trying to determine whether a cream that is rubbed on the chest will help reduce the coughing associated with a particular illness. The team conducts the research using several groups of people. Which step will most likely result in producing a dependent (responding) variable that will help validate their research?

OPTIONS:
- using a different amount of people in each trial
- writing down the names of the people in the study
- monitoring the reaction of each person in the study
- applying the same amount of cream to each person
My Answer:
applying the same amount of cream to each person