Is 6 hours of sleep enough? for over 10 years i have trained myself to live off of 6 hour sleep cycles (sleeping in on the weekends when i can). is this healthy?

Two activities mouth is in the digestive process

Why is a lunch consisting of pizza, fruit, and salad a better choice than a lunch with the same number of calories from pizza alone? a)both lunches provide the same amount of energy but the lunch of pizza, salad, and fruit provides more nutrients. b)both lunches provide the same amount of nutrients but the lunch of pizza, salad, and fruit provides more energy. c)both lunches are healthful but the lunch of pizza, salad, and fruit provides more energy for metabolism. d)both lunches are healthful but the lunch of pizza, salad, and fruit is likely to have a higher fat content.

What causes fermentation a. antibodies b. antigens c. microorganisms d. antibiotics