Answer:
They rely on the eucalyptus tree for both habitat and food.
Step-by-step explanation:
Eucalyptus trees have limited calories and nutritional content, so the koalas sleep for up to 20 hours a day to conserve energy and fat
A koalas digestive system is geared to get the most energy out of the eucalyptus leaves.
They have an organ called a caecum which contains millions of bacteria to help break down the fibre into substances that are easier to absorb
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