Which best contrasts electric doorbells and audio speakers?
a. doorbells involve rapid changes in the direction of current, and speakers do not. b. speakers involve rapid changes in the direction of current, and doorbells do not. c. doorbells require closed circuits in order to work, and speakers do not.
d. speakers require closed circuits in order to work, and doorbells do not.

In what part of a chloroplast does glucose production occur? a. atp synthase b. photosystem ii c. photosystem d. stroma

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

Graded assignment lab report answer the questions below. which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.