Multiple Choice
Which of the following organisms is considered the most recent common ancestor of living tetrapods?
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21. Evolution
Introduction to Evolution and Natural Selection
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Where did the first vertebrates evolve?
A
In the ocean
B
In the atmosphere
C
In freshwater lakes
D
On land
Verified step by step guidance1
Understand the definition of vertebrates: Vertebrates are animals with a backbone or spinal column, which is a key characteristic of this group.
Consider the evolutionary timeline: The first vertebrates are believed to have evolved during the Cambrian period, which is part of the Paleozoic Era.
Examine the environmental conditions of the Cambrian period: During this time, the Earth's environment was predominantly aquatic, with vast oceans covering much of the planet.
Identify the habitat of early vertebrates: The earliest vertebrates were jawless fish-like creatures, which indicates that they were adapted to living in water.
Conclude the most likely environment for the evolution of the first vertebrates: Given the aquatic nature of early vertebrates and the conditions of the Cambrian period, it is most plausible that the first vertebrates evolved in the ocean.
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