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Organism of the Day: Sloth
Sloth (Animal)
Sloths are extremely slow­moving mammals found in the rainforest canopies of Central and South America. There are two species of sloths:two­
toed and three­toed. Most sloths are about the size of a small dog and they have short, flat heads. The spend most of their time upside down and sleep for hours this way.
They eat mainly leaves and their digestive process can take a month or more to complete. Their stomach is what constitutes most of their weight and is composed of multiple compartments to digest the roughage.
Question: Do you think these organisms are more closely related to bears or to snakes?
Explain your reasoning. 1
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Biology
Monday, May 14, 2012
1. Organism of the Day: Sloth
2. Review Homework
3. Notes
4. Start Homework
Announcements
Due Today: Notebook Check and Study Guide
Due Tuesday/Wednesday: Read 16.3 and answer questions 1 ­ 2 and read 16.4 and answer questions 1 ­ 5.
Evolution Review: Sunday May 13th or Tuesday May 15th in room 326
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Review Homework
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Evolution Notes
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Evolution Notes
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Evolution Notes
Evolution: Darwin's Observations:
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1. Species vary globally:
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2. Species vary locally:
3. Species vary over time:
­Fossils: Preserved the remains of ancient extinct organisms.
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Evolution Notes
Influences on Darwin
James Hutton and Charles Lyell:
­ Uniformitarianism
Artificial Selection:
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Evolution Notes
Influences on Darwin
Jean ­ Baptiste Lamarck: Acquired characteristics
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Evolution Notes
Influences on Darwin
Thomas Malthus:
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Evolution Notes
Evolution by Natural Selection
1. Struggle for Existence
2. Variation and Adaptation
­ Adaptation
3. Survival of the Fittest ­ Fitness
4. Natural Selection
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Evolution Notes
Evolution by Natural Selection ­ Example
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Start Homework
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Exit Question
What is natural selection?
Reminders
Due Tuesday/Wednesday: Read 16.3 and answer questions 1 ­ 2 and read 16.4 and answer questions 1 ­ 5.
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