George is experiencing back pain. his doctor tells him the bones attached to his spinal column have become less dense. the doctor is referring to the

What causes spoilage of food through infestation and contamination, and reduces its nutritional value? a. bacteria b. enzymes c. insects d. mold e. yeast

Diagram the passage of food through the digestive system. label the organs involved in digestion and absorption and identify the sites where carbohydrates, proteins, and fats are digested.

When a researcher debriefs her participants, she: provides a detailed explanation of the study. removes their undergarments. tells them they can stop taking part at any time. provides an detailed explanation of the study, and tells them they can stop taking part at any time.