As groups, ammonoids and nautiloids have extensive fossil records. The earliest fossil ammonoids date back to the late Silurian, and the earliest nautiloids date back to either the beginning of the Ordovician, or the very end of the Cambrian.
fossil record
Most of the species have become extinct.
The list of extinct whales typically only includes those in the fossil record. However, the population of Atlantic Gray Whales went extinct in the 18th century. Extinct fossil whale species include the Durodon, Basilosaurus cetoides, and ambulocetus, The Obedenocetops is the closet to modern whales.
Nothing would happen todays time. Fossils are evidence from the past. If the toucan were to become extinct there would be no fossil records of this specific generation of toucan. The fossil record would be the same only you can look back to see what random mutation occurred that was not adventageous causing this species to go extinct.
The fossil record shows that different species have evolved over time. The fossil record also provides evidence of how a specific organism evolved from earlier species. The fossil record shows that organisms have become more complex over time. It also shows which organisms lived during the same time period, which have a common ancestor, and which have become extinct.
The answer is the fossil record :D
The coelacanth was thought to be extinct until 1938 when one was caught off the coast of South Africa. Previously only known from the fossil record, its discovery was a significant scientific find.
The fossil record organizes fos- sils by their estimated ages and physical similarities.
The fossil record organizes fos- sils by their estimated ages and physical similarities.
Not unless something very catastrophic happens. Sharks predate the dinosaurs in the fossil record so they're not going anywhere anytime soon.
No, it doesn't. consider for a moment that about 98% of all life on the planet is extinct. Now consider that the conditions necessary to produce fossils does not exist everywhere. You have a clue to why we do not have a complete, or even a miniscule record of the history of life on Earth.
The fossil record shows that periods of mass extinctions are followed by bursts of diversity in organisms. This phenomenon is known as adaptive radiation, where surviving species rapidly diversify to fill empty ecological niches left by the extinct species.