B. What do you notice about the density of the sinking objects? Dense objects feel very heavy for their size

The answer is below

Explanation:

The density of an object is its mass per unit of volume. Dense objects feel very heavy for their size, while for objects with low density they are very light for their size.  

Density is the ratio of mass to volume; it is given by:

Density (D) = mass (m) / volume (V)

An object sinks in water if the density of the object is greater than the density of water. While an objects floats on water if the density of the object is les than the density of water

that's what i got you can count the number of atoms