Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Highlight the limiting factors and list examples of limiting factors.
DEPENDENT ANALY
Limits to Growth
A female cottontail rabbit (Sylvilagus floridanus) can give birth as often as seven times a
year. A female American toad (Anaxyrus americanus) can lay thousands of eggs every
spring. So why are the meadows and forests of the eastern United States not literally
hopping with rabbits and toads? In nature, the size of a population and the rate of
population growth are influenced by what ecologists call "limiting factors."
Take It to the Limit
Think about all the different resources that two common animals need to stay alive.
Cottontail rabbits need food to eat (grasses and other plants), water to drink, and a safe
place to raise their young. American toads eat insects and, though they often live in
forest habitat, need ponds or puddles to lay their eggs. Both toads and rabbits have to
watch out for predators. But even if they avoid a hungry hawk or snake, they face other
potentially deadly dangers, including diseases, forest fires, or drought.
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Transcribed Image Text:DEPENDENT ANALY Limits to Growth A female cottontail rabbit (Sylvilagus floridanus) can give birth as often as seven times a year. A female American toad (Anaxyrus americanus) can lay thousands of eggs every spring. So why are the meadows and forests of the eastern United States not literally hopping with rabbits and toads? In nature, the size of a population and the rate of population growth are influenced by what ecologists call "limiting factors." Take It to the Limit Think about all the different resources that two common animals need to stay alive. Cottontail rabbits need food to eat (grasses and other plants), water to drink, and a safe place to raise their young. American toads eat insects and, though they often live in forest habitat, need ponds or puddles to lay their eggs. Both toads and rabbits have to watch out for predators. But even if they avoid a hungry hawk or snake, they face other potentially deadly dangers, including diseases, forest fires, or drought.
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