Hydrate ur tounge is cracked cuz ur not drink enough water
The correct answer
Flexion
This is the movement when muscles contract reducing the angle of that joint. For instance, when ones biceps contract reducing the olecranon joints degree.
The answer is number 5: defends the body against pathogens. Red blood cells do not defend the body, white blood cells do. Red blood cells' purpose is to carry oxygen to the rest of our body.
They protect the public and ensure safety on the food and drugs we may use, they regulate that.