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Describe two time-related threats to internal validity.(Note: For each threat,be sure to label it,describe it,and be sure to indicate how it specifically is a threat to the internal validity of the design.)
Nervous System
The complex network of nerves and cells that carry messages to and from the brain and spinal cord to various parts of the body.
Cortisone
A steroid hormone used as a medication to treat inflammation and immune system diseases.
Parathyroid Gland
Small endocrine glands in the neck that produce parathyroid hormone, which regulates calcium levels in the blood.
Serum Calcium Levels
The concentration of calcium in the blood, important for bone health, muscle function, and nerve signaling.
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