Question 2 all of the following are possible sources of error in a scientific investigation except for a. completing multiple trials during an experiment. b. discovering new variables as the experiment proceeds. c. not controlling all the variables in an experiment. d. using the wrong equipment during the experiment.

Aneuron is stimulated with an electric pulse. the action potential is detected at a point 3.70 cm down the axon 0.0052 s later.when the action potential is detected 7.20 cm from the point of stimulation, the time required is 0.0063 s. what is the speed of the electric pulse along the axon? (why are two measurements needed instead of only one? )

Suppose you could go back in time to interview henri becquerel on the day he discovered radioactivity. from his perspective, write an account of the discovery.

What are the pros and cons of quadrat sampling?