Migration of animals be initiated by physiological stimuli such as reproductive changes, external pressures such as weather changes, or a combination of either types of changes.

Câu hỏi liên quan

• Choose the best option:

  Deforestation is destroying large areas of tropical rain forest.

• Before dinosaurs became extinct, plant life is very different on Earth.

• Archeological studies have provided evidence that the use of plants for decoration as well as for food developed early in the history.

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• One inventor that Thomas Edison can take credit for is the light bulb.

• On February 20th, 1962, “Friendship 7” orbiting the Earth in a manned flight that lasted just under five hours

• All of the mammals, dolphins are undoubtedly among the friendly to human.

• Zoos in New Orleans, San Diego, Detroit, and the Bronx have become biological parks where animals roams free and people watch from across a moat.

• You don't love me anymore, _    ?

• Choose the correct answer to complete the sentence. "Twenty per cent of all the birds in the world ______ in the rainforest"

• He scored so good a goal that a wild cheer raised from the stands.

• Carnegie hall was the first building in New York designed special for orchestral music.

• ..................United States is ...................world's biggest consumer of energy. 

• Choose the correct answer to complete the sentence. "Centuries ago, man discovered that removing moisture from food helped _______ it."

• All the schools throughout of the country underwent the educational reform

• To help policy makers and another, the government spends as much as $1.4 million a year in collecting statistics.

• People with exceptionally high intelligence quotients may not be the best employees since they become bored of their work unless the job is constantly changing

• If dinosaurs would have continued roaming the earth, man would have evolved quite differently.

• The library at the university is new and has taken her name from the wife of the first president of the university.

• Would you show me ................... shortest way to …………. airport 

• They usually took a tree back with them and put it on the centre of the village