Question

Coccygeal bone is formed by the fusion of ____ bones in man
A) 3 vertebrae
B) 6 vertebrae
C) 5 vertebrae
D) 4 vertebrae

Answer 1

Hint:Birds are warm blooded vertebrates that belong to the class Aves. The most distinctive character of them is their ability to fly by virtue of wings. All birds do not have the same flying capacity, some can fly to long distances, some can fly to short distances and some cannot fly.

Complete answer:
Migratory birds belong to that class of birds that can fly to distances away from their normal place of living . Migration in few birds is a very regular seasonal event which occurs mostly in the northern hemisphere. Most of the migration occurs in the winter season, as a result of the environmental changes few birds tend to move to warmer countries. This helps them not only in better survival but also provides ample food source for their survival. It also provides them with a better breeding condition as most birds prefer warmer climates for breeding and feeding their young ones. The migration distance varies based on the species of the birds. Some birds show partial migration flying to short distances whereas some are capable of travelling to far away places. The timing of migration also changes according to changes in the length of the day.

Hence the correct answer is option (A) Climatic.

Note :Though migration is advantageous to birds it also has some disadvantages. These include increased predation rates and also mortality due to hunting carried on by humans.