Add $- 20 + 20$ A) 0
B) 40
C) -40
D) 20

question 22

Multiple Choice

Add: $- 20 + 20$

• A) 0
• B) 40
• C) -40
• D) 20

---

Definitions:

Thyroid Gland

A butterfly-shaped gland located in the neck, responsible for producing hormones that regulate metabolism and energy levels.

Metabolism

The complex of life-sustaining chemical transformations within the cells of living organisms.

Catecholamine Level

The concentration of catecholamines (like dopamine, epinephrine, and norepinephrine) in the body, important for stress response and mood regulation.

Thyroid Gland

An endocrine gland in the neck that produces hormones regulating growth, metabolism, and energy level.