There are _____________ pairs of ribs. Ribs is a___________bone connected dorsally to the ________________ and ventrally to the________________

Options

A. 22 pairs, thin flat bone, vertebral column and clavicle.
B. 12 pairs, thin flat bone, clavicle and diaphragm.
C. 22 pairs, thin circular bone, sternum and vertebral column.
D. 12 pairs, thin flat bone, vertebral column and sternum.

Answer

To answer the question, we need to fill in the blanks with the correct information about ribs.

1. **Identify the number of pairs of ribs**:
- In humans, there are **12 pairs of ribs**.

2. **Determine the type of bone ribs are**:
- Ribs are classified as **thin flat bones**.

3. **Identify what ribs are connected to dorsally**:
- Dorsally, ribs are connected to the **vertebral column**.

4. **Identify what ribs are connected to ventrally**:
- Ventrally, ribs are connected to the **sternum**.

Now, putting it all together, we can fill in the blanks:

There are **12 pairs** of ribs. Ribs is a **thin flat bone** connected dorsally to the **vertebral column** and ventrally to the **sternum**.

### Final Answer:
There are **12 pairs** of ribs. Ribs is a **thin flat bone** connected dorsally to the **vertebral column** and ventrally to the **sternum**.