Students wanted to test which acid was most effective at preventing hornworms from feeding on tomato plants. The students sprayed salicylic acid on one group of 15 tomato plants and jasmonic acid on a second group of 15 tomato plants. then students placed one hornworm, with a mass of 30 to 35 mg on each tomato plant. The students recorded the mass of the hornworms after one week. Which of these should the students do to make their conclusion more scientifically valid?
a. they should spray each tomato plant with more than one acid
b. they should place different kinds of worms on the tomato plants
c. they should place more than one hornworm on each tomato plant
d. they should determine the average mass of the tomato plants along with the mass of the hornworms
they should place more than one hornworm on each tomato plant
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