In an experiment on a new drug, subjects were randomly assigned to either a placebo or the active drug. In addition, the method of delivery of the drug (pill, skin patch, or nasal mist) was considered. In this experiment, there were how many factors?
A. 1.
B. 2.
C. 3.

Identify the examples in which sam interacts only with natural resources

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

50 points! which of the following is an inference? a burning candle is extinguished when it is covered with a jar. the candle burns longer than expected in a jar that has a plant in it. a plant lives longer than expected in a jar that has a burning candle. there is more oxygen in the jar because there is a plant in it.