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a
Skin is dry without glands except the oil gland at the base of the tail.
b
The digestive tract of birds has additional chambers, the rumen and gizzard.
c
Endoskeleton is bony and the long bones are hollow with air cavities.
d
Air sacs connected to lungs supplement respiration in the birds.
answer is B.
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Detailed Solution
The digestive tract of birds has additional chambers, the crop and gizzard.Ruminants include cattle, sheep, goats, buffalo, deer, elk, giraffes and camels. Ruminants have a compound stomach (with 4 compartments). Of the four compartments, the rumen is the largest section and the main digestive centre.