The extinction of dinosaur took place

Options

A. before the origin of seaweeds.
B. before the origin of first amphibian.
C. when the rise of modern fishes, birds , and placental mammals were seen
D. after the the origin of turtles .

Answer

To solve the question regarding the extinction of dinosaurs, we will analyze the options provided and determine the correct answer step by step.

### Step 1: Understand the Question
The question asks when the extinction of dinosaurs took place. We need to evaluate the provided options to find the correct timeframe.

### Step 2: Analyze Each Option
1. **Option 1: Before the origin of the seaweeds**
- Seaweeds originated in the Ordovician period. Dinosaurs went extinct around 66 million years ago, long after the Ordovician period. Therefore, this option is incorrect.

2. **Option 2: Before the origin of the first amphibian**
- The first amphibians appeared in the Upper Carboniferous period, which is also long before the extinction of dinosaurs. Thus, this option is also incorrect.

3. **Option 3: When the rise of modern fishes, birds, and placental mammals were seen**
- The extinction of dinosaurs occurred at the end of the Cretaceous period, which is part of the Mesozoic Era. The Cenozoic Era followed, during which modern fishes, birds, and placental mammals arose. Therefore, this option is correct.

4. **Option 4: After the origin of the turtle**
- Turtles originated long before the extinction of dinosaurs, making this option incorrect as well.

### Step 3: Conclusion
After analyzing all the options, the correct answer is **Option 3: When the rise of modern fishes, birds, and placental mammals were seen**.

### Final Answer
The extinction of dinosaurs took place during the Cenozoic Era, after the rise of modern fishes, birds, and placental mammals.

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