This document discusses key concepts related to how populations survive, including limiting factors, carrying capacity, and classifications of species vulnerability like endangered, threatened, and extinct. Limiting factors control population growth and include things like predators, food sources, pollution, and habitat destruction from activities like urban growth, strip mining, and intensive agriculture using fertilizers. Carrying capacity refers to the maximum sustainable population size given local resources.

1. How Populations Survive
Chapter 5, Lesson 3
limiting factor
carrying capacity
endangered species
extinct
threatened species

2. limiting factor – anything that
controls the growth or survival of
a population
predators
predators
camouflage
food sources

3. carrying capacity – the maximum
population size that the
resources in an area can support

4. endangered species – a species
that is in danger of becoming
extinct
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5. extinct – a species that has
died out completely
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6. threatened species – a species
that may become endangered

7. urban growth – the movement
from a rural (country) area to an
urban (city) area

8. pollution – when the
air, water, or soil is dirtied by
chemicals and/or trash

9. strip mining – when people carve
the land to get rocks that are
near the surface

10. fertilizer – chemicals used to
make plants grow more
effectively

11. agriculture – farming; cultivating
or growing plants for food or to
meet other needs and wants