Evidecne of evolution (regents)

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A way scientists organize Earth’s long history to show how living things have changed and evolved over millions of years

Geologic Time

Continents move slowly over time. This movements explains why some plants and animals that evolved long ago are found on continents that are now far apart.

continental drift

New ocean floor forms and moves the continents. This movement changes the positions of continents and oceans over time, which affects where organisms can live, migrate, and evolve.

seafloor spreading

Ancient remains of living organisms that look similar to living organisms

Fossil record

Fossils are found in sedimentary rock:

Lower layers = ______

upper layers = ______

Older, younger

Shows that simpler organisms resembled and evolved into ______ organisms.

more complex

Comparative Anatomy

Similarities of basic structures exist between different organisms

Homologous structures

Structures found in living organisms that no longer functioned in ancestors

Vestigial structures

Earl stages of embryo development show similiarites suggesting a common ancestor

Comparative embryology

Similar organisms have similar

• DNA (base sequence)

• Protein (similar amino acid sequence

Comparative biochemistry