Most of the cartilages in vertebrate embryos are replaced by _____ in adults.

Answer

To answer the question, "Most of the cartilages in vertebrate embryos are replaced by _____ in adults," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Cartilage**: Recognize that cartilage is a type of connective tissue that is flexible and provides support in various parts of the body, especially in embryos.

2. **Role of Cartilage in Embryos**: In vertebrate embryos, cartilage serves as the primary structural component of the skeleton. It is essential for the development of the body structure before the bones fully form.

3. **Process of Development**: As the vertebrate embryo develops, a process called ossification occurs. This is the transformation of cartilage into bone.

4. **Ossification**: Understand that ossification is the biological process where cartilage is replaced by bone tissue. This process leads to the hardening of the skeleton.

5. **Conclusion**: Therefore, in adult vertebrates, most of the cartilage that was present in the embryo is replaced by bone.

6. **Final Answer**: Fill in the blank: Most of the cartilages in vertebrate embryos are replaced by **bones** in adults.