Multiple Choice
Which of the following were the first living organisms on Earth?
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21. Evolution
Introduction to Evolution and Natural Selection
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The human tail bone (coccyx) and appendix are examples of which type of structures?
A
Analogous structures
B
Vestigial structures
C
Embryonic structures
D
Homologous structures
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Understand the definitions of the terms provided in the options: Analogous structures, Vestigial structures, Embryonic structures, and Homologous structures.
Analogous structures are features that perform similar functions but do not share a common evolutionary origin. For example, the wings of birds and insects.
Vestigial structures are remnants of organs or features that were functional in an ancestor but have lost or reduced their original function in the current organism. Examples include the human coccyx (tailbone) and appendix.
Embryonic structures refer to features present during the development of an embryo, which may or may not persist in the adult organism.
Homologous structures are features that share a common evolutionary origin and may or may not perform the same function. For example, the forelimbs of mammals like humans, bats, and whales.
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