Some kinds of organisms that once lived on earth have completely disappeared, although they were something like others that are alive today.
The most closely related standard is at a higher level of sophistication.
NSES Content Standard C
Life Science: Diversity and adaptations of organisms Grades 5-8, page 158 Extinction of a species occurs when the environment changes and the adaptive characteristics of a species are insufficient to allow survival. Fossils indicate that many organisms that lived long ago are extinct. Extinction of species is common; most of the species that have lived on the earth no longer exist. |