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The first mammals arose...

The first mammals arose

A

After the extinction of dinosaurs

B

Before the origin of dinosaurs

C

Along with the dinosaurs

D

From the dinosaurs

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### Step-by-Step Solution: 1. **Understanding the Timeline of Mammals**: - The first mammals appeared approximately 210 million years ago. This places their origin in the Mesozoic Era, specifically in the Triassic period. 2. **Identifying the First Mammals**: - The earliest known mammals were small, shrew-like creatures known as Morganucodon. They are considered to be among the first true mammals. 3. **Characteristics of Early Mammals**: - Morganucodons had several mammalian characteristics, including: - Hair covering their bodies. - Mammary glands for nursing their young. - A relatively small brain size compared to modern mammals. 4. **Evolutionary Context**: - The emergence of mammals occurred alongside the dinosaurs, but they did not evolve from them. Instead, both groups share a common ancestor that existed before the rise of dinosaurs. 5. **Conclusion**: - The first mammals arose during the Triassic period, around 210 million years ago, and coexisted with dinosaurs, but they evolved separately from them.

### Step-by-Step Solution: 1. **Understanding the Timeline of Mammals**: - The first mammals appeared approximately 210 million years ago. This places their origin in the Mesozoic Era, specifically in the Triassic period. 2. **Identifying the First Mammals**: - The earliest known mammals were small, shrew-like creatures known as Morganucodon. They are considered to be among the first true mammals. ...
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