The Skeletons of Rays and Skates Are Made of

question 40

Multiple Choice

The skeletons of rays and skates are made of

• A) bone.
• B) cartilage.
• C) protein slime.
• D) muscle.
• E) chitin.

---

Definitions:

Hematocrit

A blood test measurement indicating the percentage of red blood cells in a given volume of blood.

Erythrocyte Sedimentation Rate

A diagnostic blood examination that determines the rate at which red blood cells descend to the bottom of a test tube, a process that signals the presence of inflammation within the body.

Anemia

A condition in which there is a deficiency of red cells or of hemoglobin in the blood, resulting in pallor and weariness.

Sickle-Cell Thalassemia

A genetic disorder that affects hemoglobin within red blood cells, combining features of sickle cell anemia and thalassemia, leading to chronic anemia and episodes of pain.