Help.. The energy in food is measured in units called Calories.
a. true
b. false
17
If you eat more food than your body uses, you will lose weight.
a. true
b. false
18
Carbohydrates are used primarily to build and repair body parts.
a. true
b. false
19
Ptyalin aids in mechanical digestion.
a. true
b. false
20
Muscles in the walls of the esophagus help bring food from the
mouth to the stomach by peristalsis.
a. true
b. false

16. True

17. False

18. False

19. True

20. True

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.