Why do bacterial infections spread quickly? a. because bacterial cells cause the infected host cells to reproduce quickly b. because bacterial cells reproduce very quickly c. because bacterial cells produce large amounts of poison d. because the immune system does not recognize bacterial cells as a threat

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.