Some animals and plants are alike in the way they look and in the things they do, and others are very different from one another.
Evolution of Life
For Grades: 6-8
Learning Goal 1
Small differences between parents and offspring can accumulate (through selective breeding) in successive generations so that descendants are very different from their ancestors.
Learning Goal 2a
Individual organisms with certain traits are more likely than others to survive and have offspring.
Learning Goal 2b
Changes in environmental conditions can affect the survival of individual organisms and entire species.
Learning Goal 3a
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.
Learning Goal 5
Reproduction is necessary for the survival of any species.