Darwin's Theory Answers

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Which was Charles Darwin’s contribution to the study of biology?

A
He was the first person to recognize that organisms change over time.
B
He believed that organisms adapted through the inheritance of acquired traits.
C
He explained how traits are passed from parents to offspring.
D
He proposed that natural selection is the primary mechanism of evolution.
3

The map shows the allele frequency of sickled hemoglobin (HbS) and malaria endemicity in Africa. Which statement best explains the relationship between HbS allele frequency and malaria endemicity in Africa?

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A
When an area is malaria free, the HbS allele frequency is between 0 and 4.04.
B
When an area is holoendemic, the HbS allele frequency is between 0.52 and 4.04.
C
When an area is malaria free, the HbS allele frequency is between 12.64 and 18.18.
D
When an area is holoendemic, the HbS allele frequency is between 0 and 0.51.
4

Which statement describes natural selection?

A
It is the primary mechanism for evolution.
B
It must act on structural traits.
C
It acts to cause overpopulation.
D
It causes learned skills to become heritable traits.
5

What is natural selection?

A
a process that selects variations that help with survival and that spreads the variations to more offspring
B
a process through which nature selects an individual within a population for extinction
C
a process that causes all populations to gradually increase in size
D
a process that causes random variations to appear in the offspring of every generation
6

Which organism exhibits behavioral adaptation?

A
an owl with large pupils and eyes that enable it to see better at night
B
a possum playing dead to increase its chances of survival
C
an insect that mimics its environment to hide from its predators
D
a desert plant that sheds its leaves to lessen water loss during the dry season
7

In the African savanna, more wildebeests are born than the environment can support. Which is most likely to happen over a period of years as a result?

A
The chances for survival of the population are reduced.
B
New food sources are discovered and become the regular diet.
C
Individuals that are well suited to the environment reproduce, and those that are not well suited die before they reproduce.
D
The environment adapts by providing more resources to the growing population, increasing the chances of survival for individuals within the habitat.
9

Which best describes the relationship between evolution and natural selection?

A
Natural selection leads to evolution.
B
Evolution leads to natural selection.
C
Natural selection is the same as evolution.
D
Evolution and natural selection are not related.

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