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Multiple Choice
The evolution of which of the following structures was a key innovation in vertebrate evolution?
A
Lungs
B
Feathers
C
Jaws
D
Limbs
Verified step by step guidance
1
Begin by understanding the concept of 'key innovation' in evolutionary biology. A key innovation is a trait that allows organisms to exploit new resources or environments, leading to adaptive radiation and increased diversity.
Consider the role of jaws in vertebrate evolution. Jaws are a significant evolutionary development because they allow vertebrates to grasp, manipulate, and process food more effectively, which can lead to a wider range of dietary options and ecological niches.
Compare jaws to other structures listed, such as lungs, feathers, and limbs. While each of these structures is important, jaws are particularly crucial because they directly impact feeding strategies and survival, which are fundamental to the success and diversification of vertebrates.
Reflect on the evolutionary timeline. Jaws appeared early in vertebrate evolution, around 400 million years ago, and were pivotal in the transition from jawless to jawed vertebrates, leading to the rise of diverse groups such as fish, amphibians, reptiles, birds, and mammals.
Conclude by recognizing that the evolution of jaws represents a key innovation because it enabled vertebrates to become more versatile and adaptive, facilitating the exploration of new ecological niches and contributing to the vast diversity observed in vertebrate species today.