Question

why are glass beads used in tube 3? select all that apply. a. to rule out the possibility that the glass beads in tube 2 affect its results. b. so the volume is the same as tube 1. c. to make sure the seeds stay at the bottom.

Explanation:

In scientific experiments, glass - beads can be used to standardize volume (to ensure consistency with other tubes) and to keep seeds in place. Option A is incorrect as it is not about ruling out the effect of glass - beads in tube 2 on tube 3. Option B is valid as maintaining equal volume is important for controlled experiments. Option C is also valid as glass - beads can prevent seeds from floating.

Answer:

B. So the volume is the same as tube 1.
C. To make sure the seeds stay at the bottom.