56) The human body contains structures that are needed for survival, or in the case of vestigial structures, were needed for survival Wisdom teeth, seen here, are vestigial third molars. Human ancestors had larger jaws with more teeth. Over thousands of years, man no longer needed the third molar, and they became the source of dental problems rather than an aid in survival How does this vestigial structure support the theory of natural selection? The size of man's cranial cavity evolved. With increased cranial cavity size, the size of man's brain also grew. This resulted in a smaller jaw and no room for the third molars. A) Agriculture and the use of fire changed what and how man ate and the need for these teeth diminished over time. Jaw size and shaped evolved B) and there was insufficient room for the third molars. The climate on Earth changed from very cold to tropical The tropical climate on Earth lead to a change in the diet of humans and that lead to the need for sharp, pointed teeth rather than molars. The third molars erupt in the mouth later in the life of a human. As the Life span of human ancestors increased, the need for these third molars decreased. Man was able to live a longer life without the molars. D)
56) The human body contains structures that are needed for survival, or in the case of vestigial structures, were needed for survival Wisdom teeth, seen here, are vestigial third molars. Human ancestors had larger jaws with more teeth. Over thousands of years, man no longer needed the third molar, and they became the source of dental problems rather than an aid in survival How does this vestigial structure support the theory of natural selection? The size of man's cranial cavity evolved. With increased cranial cavity size, the size of man's brain also grew. This resulted in a smaller jaw and no room for the third molars. A) Agriculture and the use of fire changed what and how man ate and the need for these teeth diminished over time. Jaw size and shaped evolved B) and there was insufficient room for the third molars. The climate on Earth changed from very cold to tropical The tropical climate on Earth lead to a change in the diet of humans and that lead to the need for sharp, pointed teeth rather than molars. The third molars erupt in the mouth later in the life of a human. As the Life span of human ancestors increased, the need for these third molars decreased. Man was able to live a longer life without the molars. D)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:56)
The human body contains structures that are needed for survival, or in the case of vestigial structures, were needed for survivalL
Wisdom teeth, seen here, are vestigial third molars. Human ancestors had larger jaws with more teeth. Over thousands of years,
man no longer needed the third molar, and they became the source of dental problems rather than an aid in survival How does
this vestigial structure support the theory of natural selection?
ht
ing
The size of man's cranial cavity evolved. With increased cranial cavity size,
the size of man's brain also grew. This resulted in a smaller jaw and no
14
A)
room for the third molars.
Agriculture and the use of fire changed what and how man ate and
need for these teeth diminished over time. Jaw size and shaped evolved
and there was insufficient room for the third molars.
he
B)
The climate on Earth changed from very cold to tropical The tropical
climate on Earth lead to a change in the diet of humans and that lead to
the need for sharp, pointed teeth rather than molars.
C)
The third molars erupt in the mouth later in the life of a human. As the Life
span of human ancestors increased, the need for these third molars
decreased. Man was able to Live a longer Life without the molars.
D)
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