Unit 7.1: Evidence for Evolution Notes

Fossils show how the sizes of certain animals has changed drastically over millions of years

Different sedimentary rock layers provide evidence for how the environment has changed over time

Fossils show that some species have gone extinct

Fossils show how life forms present today are different than those from the past

The fossils in layer 6 are the oldest because they are closest to the top

The fossils in layer 5 are the oldest because they are closest to the top

The fossils in layer 1 are the oldest because they are closest to the bottom

They are all the same age because they are all in the same type of rock

Phylogeny

Stasis

Gradualism

Punctuated equilibrium

Gradualism

Punctuated equilibrium

Selection

Adaptive

Natural Selection

Artificial Selection

Stasis

Darwinism

homologous structures

adaptive radiation

fossils

vestigial structures

All vertebrate species have identical forelimbs.

The organisms have the same DNA.

The organisms evolved from a common ancestor.

The organisms probably use their forelimbs for the same function.

analogous structure

vestigial structure

homology

homologous structure

homologous structures

vestigial structures

analogous structures

anatomical/structural homology

embryology/developmental homology

DNA similarity

all of the above

have very different features

look very similar

show different stages of development

have only a tail if they are non-human

The land masses were once connected

They are not similar fossils

The organisms were transported to different areas of the world

The animals swam to new parts of the world before going extinct

It provides an explanation for why similar fossils are found on different continents

Continental drift (the movement of continents) provides an example of a big change in environment that would cause evolutionary pressures, driving species to evolve

It explains how the planet became warmer over the years

It provides evidence that continents are slowly growing in size

the red panda and the raccoon

the giant panda and the red panda

the American black bear and the giant panda

the giant panda and the raccoon