___________ is the study of all life forms.

Correct Answer: C

Rationale: The correct answer is C: Biology. Biology is the study of all life forms, including their structure, function, growth, origin, evolution, and distribution. Anatomy (A) focuses on the structure of living organisms, while physiology (B) deals with the functions of living organisms. Geology (D) is the study of the Earth's physical structure and substance, not life forms. Therefore, Biology is the correct choice as it encompasses the study of all living organisms and their processes.

Correct Answer: C

Rationale: The correct answer is C: Chickenpox in a person who has never had it. The shingles virus, also known as the varicella-zoster virus, is the same virus that causes chickenpox. When a person who has had chickenpox before is re-infected with the virus, it can reactivate and cause shingles. Shingles presents as a painful rash with blisters on the skin along the path of a nerve. Therefore, choice C is correct. Choices A, B, and D are incorrect because shingles is not caused by scabs due to mites, abrasions due to friction, or a severe fungal infection.

Correct Answer: C

Rationale: The correct answer is C: Carbon dioxide. The lungs facilitate the exchange of oxygen and carbon dioxide during respiration. Oxygen is taken in, and carbon dioxide is expelled from the body through breathing. Carbon dioxide is a waste product produced by cells during cellular respiration. Choices A, B, and D are incorrect because nitrogen is not directly involved in the respiratory process, hydrogen is not a major component of respiration, and carbon monoxide is a toxic gas that interferes with oxygen transport in the body.

Correct Answer: A

Rationale: The correct answer is A: Brain. The brain is a vital component of the central nervous system that processes information, controls actions, and regulates bodily functions. It receives and interprets signals from nerves, eyes, and ears. Nerves (choice B) are part of the peripheral nervous system, not the central nervous system. Eyes and ears (choice C) are sensory organs that transmit information to the brain but are not part of the central nervous system. The autonomic nervous system (choice D) is a division of the peripheral nervous system responsible for involuntary bodily functions.

Correct Answer: C

Rationale: Rationale: 1. Iodine is essential for thyroid hormone synthesis. 2. Thyroid hormones regulate metabolism, growth, and development. 3. Common table salt is often iodized to prevent iodine deficiency. 4. Potassium, Magnesium, and Copper do not play a direct role in thyroid function. Summary: - Choice A, Potassium, is important for heart and muscle function. - Choice B, Magnesium, is crucial for nerve and muscle function. - Choice D, Copper, is needed for red blood cell production.