““As I glided further into the dusty mollusk volumes, I discovered that gastropods - which account for 80 percent of all mollusks - are one of the most successful animal groups. They have existed for half a billion years, surviving or reevolving through several mass extinction events. They make their home in nearly every habitat on earth. While thirty-five thousand living terrestrial snail species have been documented, tens of thousands are not yet identified.””
![“There are about 250,000 different species of fossil plants and animals known . . In spite of this large quantity of information, it is but a tiny fraction of the diversity that [according to the theory] actually lived in the past. There are well over a million species living today and . . [it is]…” quote by David M. Raup](https://sms4smile.com/quotes/img-quotes/37b/david-m-raup-33751_animal_there-are-about-250-000-different-specie_264230.jpg)
