enzymatic hydrolysis
regurgitation
demineralization
elimination
dehydration synthesis

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Why are cattle able to survive on a diet consisting almost entirely of plant material?
They have cellulose-digesting, symbiotic microorganisms in chambers of their stomachs.
Cattle, like the rabbit, reingest their feces.
They are autotrophic.
Cattle saliva has enzymes capable of digesting cellulose.
They manufacture all 15 amino acids out of sugars in the liver.

Hibernation and estivation are both examples of
evaporative cooling.
acclimatization.
shivering thermogenesis.
torpor.
non-shivering thermogenesis.