5th Grade Ch. 6 Lesson 3 How do Changes Cause More Changes
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Transcript of 5th Grade Ch. 6 Lesson 3 How do Changes Cause More Changes
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Ch. 6 Lesson 3How do changes
cause more changes?
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pesticide•poison that kills insects
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Mosquitoes spread diseases- Mosquitoes spread diseases- malaria & West Nile virusmalaria & West Nile virus
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Some mosquitoes develop adaptations to survive pesticides.
They inherited genes that allow them to survive around the
pesticide.
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antibiotics• medicines used to kill disease-causing bacteria
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Some bacteria develop adaptations to survive antibiotics-
makes diseases harder to treat.
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extinct• species where no members
of its kind are alive
dodo bird
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fossils• sources of evidence of past
extinctions of plants & animals
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bald eagle1. pesticides (DDT)
washed into rivers & streams
2. fish - DDT 3. eagle ate fish 4. caused birds to lay thin
shelled eggs5. 1972-DDT banned6. population began to
recover
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DDTDDTdichlorodiphenyltrichloroethane
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DDT makes birds’ shells thin
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Bald eagles could not adapt to
pesticide.Bald Eagle Web Cam