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Evidence for Evolution

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by

Wendy Queyrel

on 20 March 2017

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Transcript of Evidence for Evolution

Essential Question: How do we know that living things change over time?
Evidence for Evolution
Facts:
OBSERVATIONS
about the world around us.
Differences Between Organisms
Plate tectonics
Germ Theory
Cell Theory
Big Bang Theory
Gravity
Atomic Theory
Electromagnetism
Examples of Scientific Theories
Hypothesis: A possible testable
EXPLANATION
for why or how something happens.
Theory: An explanation based on
EVIDENCE
, tests, and repeated experiments.
Law: A statement based on repeated observations that describe some phenomenon of
NATURE
.
Adaptations are characteristics that help an organism
SURVIVE
.
examples:
CAMOUFLAGE
in animals
Opposable thumbs in
PRIMATES
Fur for
WARMTH
Species
a species is a group of organisms that can mate with each other and produce
FERTILE OFFSPRING
examples: canus lupus familiaris (
DOG
) and Homo sapien (
HUMAN
)
living things are always
CHANGING
evolution is the process in which populations
CHANGE
over time
Evidence for Evolution
1. Fossils
2. Comparative Anatomy
3. Molecular Evidence
Fossils
looking at the
FOSSIL RECORD
, scientists can see the changes in organisms from the past
example: the fossil record shows that the ancestors of
WHALES
walked on
LAND
Comparative Anatomy
scientists compare modern organisms to see how
CLOSELY RELATED
they are
examples: bones are similar in a bat wing, cat leg, dolphin flipper, and human arm showing they share a
COMMON ANCESTOR
that they inherited the bone structure from
Molecular Evidence
scientists compare
MOLECULES
like DNA and proteins to see evolutionary relationships between organisms
example: human and chimpanzee DNA is over
98%
the same suggesting their common ancestor is in the recent past (6-8 million years ago)
Branching Diagrams
scientists use evidence from
FOSSILS
,
ANATOMY
, and
MOLECULES
to create branching diagrams
branching diagrams show the evolutionary
RELATIONSHIPS
between species
Theory vs. Hypothesis vs. Law
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Full transcript