Many thousands of layers of sedimentary rock provide evidence for the long history of the earth and for the long history of changing life forms whose remains are found in the rocks.
Learning Goal 3b
More recently deposited rock layers are more likely to contain fossils resembling existing species.
Learning Goal 4
Most species that have lived on the earth are now extinct. Extinction of species occurs when the environment changes and the individual organisms of that species do not have the traits necessary to survive and reproduce in the changed environment.
For Grades: 9-12
Learning Goal 1
The basic idea of biological evolution is that the earth's present-day species are descended from earlier, distinctly different species.
Learning Goal 2
Molecular evidence substantiates the anatomical evidence for evolution and provides additional detail about the sequence in which various lines of descent branched off from one another.
Learning Goal 7
Modern ideas about evolution and heredity provide a scientific explanation for the history of life on Earth as depicted in the fossil record and in the similarities evident within the diversity of existing organisms.