5. Which of the following statements about a con- trolled experiment is true?
a. All the variables must be kept the same.
b. Only one variable is tested at a time.
c. Everything can be studied by setting up a co
trolled experiment.
d. Controlled experiments cannot be perform
on living things

For each of the following, decide whether the statement describes photosynthesis, cellular respiration, or both. releases energy in the form of atp. stores energy in glucose molecules. performed by producers. performed by consumers.

Which of the following is a common response to cell signaling?

According the inverse square law, doubling the distance from the source of the sound, a speaker, for example, will drop the sound 6 db each time. if you were standing in the back of an auditorium, 32 feet away from a speaker not using any amplification, would you be able to hear a speaker clearly? why or why not?