Question

groups of students conduct an experiment to determine whether lettuce plants produce more leaves under red, or green light. the groups collect the following data.
group 1

color of light	number of leaves
red light	63
blue light	115

group 2

color of light	number of leaves
red light	31
blue light	72

which instrument should each group use to measure the mass of the lettuce leaves?

Explanation:

To measure the mass of lettuce leaves, a balance (such as a digital balance or a triple - beam balance) is the appropriate instrument. Balances are specifically designed to measure the mass of objects. In a scientific experiment like this one, which is related to plant growth (a topic in Biology, a subfield of Natural Science), a balance would be used to accurately determine the mass of the lettuce leaves. Other instruments like rulers are for measuring length, and thermometers are for measuring temperature, which are not relevant for measuring mass.

Answer:

A balance (e.g., digital balance, triple - beam balance) should be used by each group to measure the mass of the lettuce leaves.