Copulation of male and female frogs is called amplexus, because

Answer

To answer the question "Copulation of male and female frogs is called amplexus, because...", we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Amplexus**:
- Amplexus is a specific mating behavior observed in frogs where the male frog grasps the female frog. This position allows the male to be in close proximity to the female during the egg-laying process.

**Hint**: Think about the physical interaction between male and female frogs during mating.

2. **Identifying the Process**:
- During amplexus, the male frog uses his copulatory pads (specialized structures on his forelimbs) to hold onto the female. This is crucial since frogs do not have traditional copulatory organs.

**Hint**: Consider how frogs adapt their mating behavior due to the absence of certain anatomical features.

3. **Fertilization Method**:
- Frogs exhibit external fertilization, meaning that after amplexus, the female releases her eggs into the water, and the male simultaneously releases sperm over the eggs to fertilize them.

**Hint**: Reflect on the differences between internal and external fertilization and how it applies to frogs.

4. **Conclusion on Amplexus**:
- The term "amplexus" is used because the mating process does not involve copulatory organs. Instead, it relies on the physical grasping of the female by the male and the subsequent external fertilization of the eggs.

**Hint**: Think about why the absence of copulatory organs would necessitate a different term for the mating process.

5. **Final Answer**:
- Therefore, the correct reason why copulation of male and female frogs is called amplexus is that frogs have no copulatory organs.

### Summary Answer:
Copulation of male and female frogs is called amplexus because frogs have no copulatory organs, and this behavior facilitates external fertilization.