Name the heaviest and longest bone in the human body.

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks for the heaviest and longest bone in the human body.

2. **Recall Knowledge of Human Anatomy**: Consider the bones in the human body and their characteristics. The femur is known to be a significant bone in terms of size and weight.

3. **Define the Femur**: The femur is commonly referred to as the thigh bone. It is located in the lower limbs.

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