Which of the following statements is false? A)
Concentration is the number of particles in a given unit of volume.
B)
Viscosity lets a water strider(insect) walk on the calm surface of a pond.
C)
Candle wax is an amorphous solid.
D)
A gas is a fluid.

think I already know the answer but just checking

Which scientific design has both practical limitations and limitations due to scale? studying the effect of bleach on the growth of mold spores exposing cultures of duckweed to different intensities of light observing the replication of dna molecules with a hand lens using colored marbles to model a cross between two colors of rabbits