The type of cartilage that cushions bones in the knees and in the pelvic girdle are .

The type of cartilage that cushions bones in the knees and in the pelvic girdle is known as fibrocartilage.

Here are the steps to answer this question:

1. Understand the question: The question is asking about a specific type of cartilage that is found in the knees and pelvic girdle.

2. Recall knowledge about cartilage: Cartilage is a flexible connective tissue found in many areas of the body. It can bend a bit, but resists stretching. Its main function is to hold tubes open (respiratory tract) and cushioning (joints).

3. Identify the specific type of cartilage: There are three types of cartilage: hyaline, elastic, and fibrocartilage. Hyaline cartilage is the most common and is found at the ends of long bones, ribs, and nose, and in the larynx, trachea, and bronchi. Elastic cartilage is found in the external ear flaps and in parts of the larynx. Fibrocartilage is the strongest and most durable. It is found in areas of the body where a lot of weight is put on the joint, like the knees and the pelvic girdle.

4. Answer the question: Therefore, the type of cartilage that cushions bones in the knees and in the pelvic girdle is fibrocartilage.