Question:

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Question What are the characteristics of a
mammal? Homework (regents) p. 845 1, 3, 12, 15
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Mammalia The Mammals
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Characteristics of Mammals

• Have hair
• Use milk for young
• through Mammary glands
• Four-chambered heart
• Endothermic

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Specialized features

• Temperature control
• Layer of fat under skin
• Sweat glands
• together ? homeostasis
• Feeding
• Specialized teeth

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Specialized features

• Circulation
• Highly specialized four-chambered heart
• Respiration
• Lung intake regulated by diaphragm
• muscle around lungs that causes them to inflate
• Excretion
• Kidney function to filter out urea (waste) and
  regulate water levels in body

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Specialized features

• Response
• Cerebral Cortex!!!
• Allows for higher-level though
• ex. Reading, decisions, etc.
• Movement
• back with flexible vertebrae
• specialized pelvic girdles for specific movements

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Types of Mammals

• 3 types, classified by way animals develop
• Monotremes
• egg-laying mammals
• duckbilled platypus
• Marsupials
• development finished in puch
• kangaroo
• Placental mammals
• all that give birth to live young
• horse, whale, mouse, dog, primates

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Primates

• Have a well-developed cerebrum
• allows for more complex behavior
• fingers, toes
• arms with ball-in-socket joint that can rotate
  freely
• binocular vision (suggests need for depth
  perception)
• Genus Homo
• fossils show in Africa about 2.5 million years
  ago
• Homo sapiens
• Out of Africa model
• evolved in Africa 200,000-150,000 years ago
• left Africa in many migrations
• supported by mitochondrial DNA samples showing a
  common ancestor

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Questions What makes a whale a mammal? Is a
dog a predator or prey? Explain.
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Review Table Bacteria Protista Plantae An
imalia Fungi
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Class review Chapter 33 Review 1-6, 11