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10 Cards in this Set
- Front
- Back
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Mammalia is a sister group to?
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Other amniotes. They belong to amniotes too.
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What is homeotherms or endotherms?
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A characteristic of mammals. Refers to their ability to regulate body temperature by physiological means not behavioral means.
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Do mammals perform "live bearing"? What is live bearing? Does this cause extensive parental care? If so, what does the parent must provide nutritionally for the offspring?
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Yes, born without an egg. Yes, youngs must be nourished with milk produced by mammary glands via nipples.
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Describe the types of hair that help constitute the "pelage fur coat"?
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Under hair - thin + short hair. Help prevents dessication + heat conservation.
Guard hair - more straight. Protection. Difficult to tear through. Vibrissae - mustache or whiskers of a mouse. Acts as feelers - move in the dark. |
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Describe the main central nervous system component of mammals.
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A highly developed neocortex. Outer portion of the cerebrum made of layers varying in numbers by species.
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What are the three mammalian orders? Which order has the placenta? What is the placenta?
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Monotremata = eggs laying animals. Echidnas - spiny anteaters. Platypus. Since they lay eggs = no placenta.
Marsupialia - pouched animals. Ex. Kangaroo. Eutheria - the young develops in the uterus. Complex behaviors and social communication. Heavy invest |
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What is implantation?
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Process by which embryo adheres to the wall of the uterus. Placenta develops after this phase.
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What is lactation?
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A post nutritional process where birth hormones stimulate and regulate lactation - maternal milk, as long as young continues to consume.
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Why is living in a group helpful?
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1. One can obtain protection from predators.
2. Division of labor 3. Food acquisition = enhanced. |
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What are density independent factors? Density dependent factors?
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Regulates population sizes. Density independent are usually natural disasters - does not care if there are two or two million people.
Density dependent factors are ecological factors such as food availability, space, and predators. These factors influence |
