AnswersEnvironmental Science AMeasuring Populations

Measuring Populations Answers

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The most common type of distribution pattern(s) in nature is(are) _______.

A
regular
B
random
C
cluster
D
a and b
2
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Natural selection is best described as _______.

A
disruptive selection
B
stabilizing selection
C
a mechanism of evolution
D
directional selection
3

Contrast disruptive and stabilizing selections.

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4

What distinguishes disruptive and directional selection pressures when both select for extreme genetic traits?

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5

Regular distribution is observed for many organisms due to _______.

A
the need to maximize exposure to sunlight
B
the need to avoid predators
C
interactions between individuals
D
the plentiful availability of water
6

Adaptive melanism describes selection for _______.

A
mottled pigmentation
B
lighter pigmentation
C
darker pigmentation
D
more colorful pigmentation
7

Explain how and why natural selection has allowed species such as sharks and alligators to remain genetically stable for thousands of years.

Answer not available
8

Which of the following is not true about the distribution of species?

A
A species’ native range does not include areas where it was introduced by humans.
B
Some species have a range they inhabit only for breeding.
C
Seasonal ranges include areas where species are found for part of the year.
D
All the organisms in an ecosystem share distribution patterns.
9

Explain why random distribution patterns for species are the rarest in nature.

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10

Among humans more boys are born than girls, but women have significantly higher life expectancies. What is the significance of this?

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