change over time … evolution objectives: 1.define evolution. 2.how do we know the living world has...
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Change Over
Time …
Change Over
Time …
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EvolutionObjectives:
1. Define evolution.
2. How do we know the living world has changed over time?
3. What can you learn from fossils?
4. Define natural selection.
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Why Change?• Changes in the environment can
have an impact on living organisms
Three options:
• Adapt – change and find a way to survive in the new situation
• Move – migrate to a new location; either temporarily or permanently
• Extinction – failure to adapt
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Evolution• The process of
biological change over time
• Organisms of the present differ from ancestors of the past Charles
Darwin
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Evolution – How do we know?
1. Some organisms evolve or change very quickly and can be observed
2. Examples: bacteria and insects
3. Fossils are evidence of past life
4. Examples: bones, teeth, footprints, shells, feather impressions, etc.
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Fossils• Early organisms
were simple in form
• Organisms became more complex over time
• The diversity of life has increased over time
• New organisms appear and others die off (extinct)
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Evolution – How do we know?
Hyracotherium – “early horse”
20 cm tall
55 million years ago
Equus – “modern horse”
300 cm tall
Today
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Why do living things evolve?
• Response to changes in the environment
• Ex. changes in climate, vegetation, or introduction of new organisms
• Some organisms have variations that allow them to adapt to changes
• Ex. genetic mutations
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Natural Selection• Organisms with
favorable variations are more likely to:
• survive
• reproduce
• produce offspring with these variations
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Artificial Selection
Human beings have been using evolution for centuries!!Thousands of years ago wolves were taken as pets by humans. Each culture had specific traits they wanted these animals to have. Today we have hundreds of different types of dogs that are extremely different from one another