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Write any four salient features of Class-Aves with two examples.
Define "Alteration of generation", with one example,
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four silent feature of class aves are:
•there skin is dry without gland except the oil gland at the base of the tail.
•Endoskeleton is fully ossified and the long bone are hollow with air cavities.
• the digestive tract of bird has additional chamber, the crop and gizzard.
•they are homoiothermous.
eg:corvus, Columba
alternation of generation -the cindarins exist in both the form exhibits alternation of generation i.e. polyps produce medusae asexually and medusae form the polyps sexually. eg-obelia
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