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. Which of these processes would NOT be a part of a scientific investigation of an infectious disease? (Points : 1)
cataloguing symptoms
forming a hypothesis
intentionally infecting people
researching the disease

2. In an experiment, 20 pea plant seeds were placed on moist filter paper. They were kept at a temperature of 25°C. Half of the seeds were given 5 minutes of light. The other 10 seeds were kept in the dark. After 24 hours, the height of seedlings sprouted from the seeds were measured. What was the independent variable in this experiment? (Points : 1)
the number of seeds used
the amount of time the seeds were observed
the temperature at which the seeds were held
the exposure of seeds to light

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