Select the incorrect statement$(s)$.

• A
  Natural selection is based on heritable variations and the production of a large number of offspring through reproduction.
• B
  During the establishment of natural selection,many organisms acquire values other than the mean character value.
• C
  $500$ million years ago,invertebrates were formed and were active.
• D
  Reptiles lay thick-shelled eggs that do not dry up in the sun unlike those of amphibians.