Which of the following describes a medical drug?

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A. A bacterium that causes a human disease

B. A chemical substance used to treat disease

O

C. A virus that is passed from person to person

O

D. A physiological symptom related to a sickness

Plants take in and release carbon dioxide. Plants take in carbon dioxide for photosynthesis. What process releases carbon dioxide back into the atmosphere?

What is an aphelion? How does it differ from a perihelion? (Long answers are not mandatory.)

Which of the following statements is true? a. There is less water on earth now than there was millions of years ago. b. There is less water on earth now than there was millions of years ago. c.

What is the preferred treatment by most physicians for an athlete with a hernia?

A substance received or given off by your body will likely pass through which tissue type? A substance received or given off by your body will likely pass through which tissue type? Connective tissue nervous tissue muscle tissue epithelial tissue

What is the genotype for individual D

Are aliens and UFO's real

What happens once intercelluar signals reach the inside of a cell using some type of receptor? the signal stops. the signal is transferred to the cytoplasm. the signal produces protein. intracelluar communaction takes over.

What is extinction and why does it occur?

Corn smut and wheat rust are crop diseases caused by fungi.