Question

the passage below describes an experiment. pam and her friends went swimming in the ocean. when they got out, they played on the beach as the ocean water evaporated from their bodies. pam wondered if adding salt to water affects how quickly water evaporates. when pam got home, she set up nine glasses with one cup of tap water in each glass. she added four tablespoons of salt to each of three glasses and two tablespoons of salt to each of three other glasses. she added no salt to the final three glasses. every day for one week, she measured the amount of water left in each glass. complete the sentence. in this experiment, the glasses with two tablespoons of salt were part of _ a control group an experimental group

Explanation:

In an experiment, the control group has no independent - variable manipulation, while the experimental group has the independent variable (in this case, salt) added. The glasses with two tablespoons of salt have the independent variable (salt) added, so they are part of the experimental group.

Answer:

an experimental group