general bio

Question 1

Scientists who investigate disease may look at risk factors. What is a risk factor?

Answer 1

Something that increases chance / increases probability / makes it more likely

Question 2

Scientists used healthy volunteers in investigations . Why was it important that the volunteers were healthy?

Answer 2

not affected by other factors

Question 3

The scientists randomly divided the volunteers into two groups . Explain why they divided them randomly.

Answer 3

Avoids bias / selection (by scientists)

Question 4

Describe how the control group should have been treated.

Answer 4

Same as experimental group but without the factire being tested eg flavenoids in dark chocolate