2 g/cm³

4 g/cm³

8 g/cm³

2 g/in³

The fish because he is in the middle

The cork because it is floating at the top of the water

The rock because it is at the bottom

The cork and the rock because they have the same about of atoms.

3 g/cm³

9 g/cm³

.33 g/cm³

27 g/cm³

 $D\ =\ \frac{M}{V}$  

 $S\ =\ \frac{D}{T}$  

 $D\ =\ \frac{V}{M}$  

 $S\ =\frac{T}{D}$  

A, B, and D are the same

B, C, and D are the same

None of the samples are the same