Questions and Answers
Which piece of evidence would be most helpful in strengthening the case for continuing to classify a platypus with the mammals?
How are scientists able to use fossils of extinct organisms as evidence?
Fossils can help scientists trace physical changes and compare how organisms looked over time.
How does comparing the physical appearance of embryos of different species support the theory of evolution?
It shows that these organisms share a common ancestor.
Why is it important to have supporting evidence from a variety of fields in developing evolutionary theory?
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What does the observation that the front limbs of birds and reptiles have similar homologous structures support?
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List the ancestors of the modern horse, in order, from the oldest that lived 60 million years ago to the most recent that lived 7 million years ago: Hyracotherium, __________, __________, __________.
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Study Notes
Classification of the Platypus
- The platypus is classified as a mammal due to its fur and ability to produce milk, despite its unique trait of laying eggs.
- DNA evidence indicating a closer relation to mammals than other vertebrates would reinforce its classification as a mammal.
Fossils as Evidence
- Fossils serve as crucial evidence by allowing scientists to track physical changes in extinct organisms.
- Comparative analysis of fossils helps illustrate the morphological transformations of species over time.
Embryonic Similarities
- Similarities in the embryos of birds, reptiles, and mammals support the theory of evolution.
- These embryonic similarities suggest a shared common ancestor among these species.
Diversity of Evidence
- A variety of supporting evidence from different fields enhances the credibility of evolutionary theory.
- Consensus from diverse sources strengthens arguments by providing a more comprehensive understanding of evolutionary processes.
Homologous Structures
- The presence of homologous structures in the front limbs of birds and reptiles supports the idea of a common ancestry.
- This anatomical similarity indicates that birds and reptiles share evolutionary roots.
Evolution of Horses
- Horses, characterized by a single hoof, have evolved over time from ancestors with multiple toes.
- Fossil evidence of intermediate species outlines the evolutionary pathway of horses, demonstrating a decrease in toe number and an increase in body size.
- The correct sequence of horse ancestors from oldest to most recent includes Hyracotherium, Mesohippus, Merychippus, and Pliohippus.
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Description
Test your knowledge on evolution with these flashcards focusing on unique creatures like the platypus. Explore the key concepts of classification in biology and understand the evidence that supports mammalian traits. Perfect for reinforcing your understanding of evolutionary biology.
