What is sequence in the evolution of mammals?

Options

A. Fish-amphibian-bird-mammals
B. Insect-fish bird-mammals
C. Fish-amphbian-reptile-mammals
D. Fish-amphibians-repitle-bird-mammals

Answer

**Step-by-Step Solution:**

1. **Fish**: The evolution of mammals begins with fish. The earliest vertebrates were jawless fish, which later evolved into bony fish.

2. **Amphibians**: From bony fish, the next step in the evolutionary sequence is the emergence of amphibians. These organisms were capable of living both in water and on land and had features such as gills and fins.

3. **Reptiles**: Amphibians eventually evolved into reptiles. Reptiles are fully adapted to life on land, possessing scales and being cold-blooded.

4. **Synapsids**: Within the class of reptiles, a specific group known as synapsids emerged. These organisms are significant as they represent the transition from reptiles to mammals.

5. **Mammals**: Finally, synapsids evolved into mammals. Mammals are characterized by features such as lungs and a more complex structure that allows them to thrive on land.

**Final Sequence**: Fish → Amphibians → Reptiles → Synapsids → Mammals

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