Look for the dependent and independent variables
a. Scientistsinject50 after exposure to Ebola and 50 different people after a 21-day delay. The number of people who contract Ebola are counted.

Which of the following would be a body response when stepping outside without a coat on a snowy day? a. senaceous glands. secrete more senum b. more liquid is transported by the body to the skin fir insulation c. blood vessels in the skin narrow and contract d. blood vessels in the skin expand