"Which statement best describes an activity performed by a student investigating an abiotic factor using this setup?

(1)He records the temperature of the water.

(2)He feeds the fish 0.5 gram of fish food twice a day.

(3)He measures the growth of the plants with a metric ruler.

(4)He observes the snail scrape algae off the gravel."

Which statement best describes an activity performed by a student investigating an abiotic factor using this setup? (1)He records the temperature of the water. class=