WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
5th Edition
ISBN: 9781319516116
Author: PHELAN
Publisher: MAC HIGHER
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Chapter 18, Problem 5MC
Summary Introduction
Introduction:
Extinction has many natural causes, but expansion of human population is currently the most significant cause.
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Which of the following best describes a keystone species?
a. An organism, whose introduction causes or is likely to cause environmental harm
b. An organism, who if removed, the entire ecosystem changes.
c. Can signal a change in the biological condition of a particular ecosystem and diagnose the health of that ecosystem
d. Can indirectly protect several other species in the same habitat
16. Which is not a cause of extinction?.
A. Animals eat too much
B. Habitat loss C. Natural disasters
D. over-hunting
17. How can you help prevent extinctions?
A. By not polluting our environment.
B. By protecting sensitive habitats and species.
C. By not eating or buying products from endangered animals.
D. By allowing other people to hunt for their food.
18. Which of the following was a natural factor that caused extinctions?
A. Changes in the oxygen levels
C. Over harvesting
B. Habitat destruction
D. Pollution
19. What do most scientists think caused the mass extinction of dinosaurs and other organisms
at the end of the Cretaceous period?
A. An object from space struck Earth.
B. An ice age covered most of Earth with ice.
C. The dinosaurs ate too many other organisms and then starved.
D. Volcanic eruptions covered large areas with lava.
20. This.is the extinction of a species one by one, not a sudden loss of many species
A. Background extinction
B. Biotic potentíal
C. Fragmentation…
Why does the aquarium trade contribute to the introduction of nonnative species?
a.
Exotic species can escape or be released into local ecosystems.
b.
Aquarium owners do not always understand how ecosystems interact.
c.
Nonnative fish are shipped worldwide for aquariums.
d.
All of the above
Please select the best answer from the choices provided
A
B
C
D
Chapter 18 Solutions
WHAT IS LIFE? ACHIEVE 1 TERM ACCESS CODE
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