Why are controls not needed in the arthropods experiment described in the study guide? all experiments must include controls. the treatments can be compared to each other instead of to a control. there is no way to make a control in that kind of experiment. the hypothesis is not falsifiable.

How do water’s relative densities as a solid and a liquid differ from that of most other substances? water’s solid and liquid forms have different densities, while most other substances have solid and liquid forms with similar densities. water’s solid and liquid forms have similar densities, while most other substances have solid and liquid forms with different densities. water’s liquid form is less dense than its solid form, while the opposite is true of most other substances. water’s solid form is less dense than its liquid form, while the opposite is true of most other substances.