AP BIOLOGY

Detailed explanation-1: -Darwin collected preserved remains of organisms called fossils. Some fossils looked like current animals, others looked completely different. Question: How were they related to living species?

Detailed explanation-2: -Observing fossils similar to bones of the modern tucutucu or tuco-tuco, a small rodent of the genus Ctenomys, Darwin realized that species were replaced in time by similar species. Darwin wondered, if extinction of species occurs, as testimonied by the fossil record, how did the planet got repopulated over time?

Detailed explanation-3: -Darwin collected the preserved remains of ancient organisms, called fossils. Some of those fossils resembled organisms that were still alive. Others looked completely unlike any creature he had ever seen. Darwin observed that the Galápagos Islands were close together but had very different climates.

Detailed explanation-4: -Fossils are the preserved remains of plants and animals whose bodies were buried in sediments, such as sand and mud, under ancient seas, lakes and rivers. Fossils also include any preserved trace of life that is typically more than 10 000 years old.

Detailed explanation-5: -His discoveries included four different species of giant ground sloth (some of the largest land mammals ever to have lived), a gomphothere and the remains of an extinct horse. Many of Darwin’s fossils survive, at the Museum and elsewhere.