Which change that occurs to food in the digestive system is a physical change and not a chemical change?
a. bacteria converting lactose into simple sugars in the intestines
b. digestive enzymes breaking down proteins into smaller fragments.
c. teeth grinding an almond into smaller pieces in the mouth
d. saliva converting food molecules into simple sugars

Don recorded his food intake for a week and then used a computerized dietary analysis program to analyze his diet. according to the results of the analysis, his average daily saturated fat intake was 5% of total calories and his average daily unsaturated fat intake was 12% of total calories. based on this information, his total fat intake is the acceptable macronutrient distribution range.

During the past few weeks or months, have you noticed any exercises that have become too easy for you? do you think you need to increase the intensity in any of the three exercise areas in your workouts? evaluate your exercise progress in the three exercise areas (cardiovascular, resistance, and flexibility) and list what modifications, if any, you may need to make in your exercise routine.

1. true or false decay destroys tooth enamel 2. true or false- tooth decay starts when plaque builds up on your teeth