SBI3U- Evidence for Evolution I

Evidence for Evolution I: The Geological Record How old is the Earth determined by science? ____________________________

Scientific Methods for Dating the Earth: Absolute Dating

Absolute dating -

Radiometric Dating

Radioisotope: An atom with an unstable nucleus capable of __________________________________. These _____________atoms give off particles over time and change into _______________________.

Example:

Half-life: The amount of time it takes for __________________________________________.

How much Carbon-14 is left after two half-lives?

_________________________

How much Carbon-14 is left after three half-lives? ____________________________________

Example: Carbon-14 has a half-life of _______________________ years.

How many years would it take before only 1/4 of the Carbon-14 remains? _____________________________

How many years would it take before only 1/8 of the Carbon-14 remains? ____________________________

What are two other types of radiometric dating:

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Is Age Significant?

_________________is a process that occurs over hundreds of thousands or millions of years.

Radiometric dating suggests our planet is _____________________________________ years old.

Scientific Methods for Dating the Earth: Relative Dating

Relative dating –

Why do we use relative dating today? Some _________________ don’t have _________________ ______________ so we must use _______________ ____________________.

It’s still useful today especially when used with _________________ _______________________.

Evidence for Evolution: The Fossil Record

Fossils: ancient remains, impressions, or traces of an organism that have been preserved in _____________________________________________________________.

Factors in Fossil Formation:

__________________ must be absent, to prevent the body from being decomposed by microorganisms

__________________________ are more likely to be preserved than ___________________________.

Organisms may be preserved whole in ________________________

Plate Tectonics: The scientific theory that describes _____________________ ____________________________________________ and features of Earth’s _____________.

Plate Tectonics and Pangaea

Plate tectonic theory states that _______________________________________________.

The supercontinent that existed 200 million years ago is known as ______________________________.

Fossils and Plate Tectonics

How does plate tectonic theory explain fossils of the same species that have been found in Africa, India, and Antarctica, but nowhere else on earth?

_____________________________________________________________________________________________________________________________.

The Fossil Record

List three reasons fossils are significant in the study of evolution:

1)_______________________________________________________________

________________________________________________________________

2) _______________________________________________________________

_________________________________________________________________

3) _______________________________________________________________

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Fossilized species often resemble ____________________ ____________________.

Example: _________________________

Name a species where the fossil lineage is very detailed: _________________________________.