Q: Stretching is considered an important step before engaging in sports. In an investigation to see whether stretching before physical exertion reduces sports injuries, who would the control group most likely be?

OPTIONS:
- athletes who stretch before working out
- non-athletes who stretch before working out
- athletes who do not stretch before working out
- non-athletes who do not stretch before working out
A: athletes who do not stretch before working out
Q: The action of turning off the water while brushing teeth is an example of

OPTIONS:
- recycling.
- adaptation.
- conservation.
- resourcefulness.
A: conservation.
Q: Which human body system produces the hormones that regulate growth?

OPTIONS:
- skeletal
- digestive
- circulatory
- endocrine
A: endocrine
Q: Paula determines a property of a marble using a balance and a graduated cylinder. What property is Paula most likely determining by using both tools?

OPTIONS:
- density
- length
- mass
- volume
A:
density