Предмет: Биология, автор: stopakk1416

даю 20 балов.У чому різниця в будові серця у риб, земноводних і птахів?
пж помогите

Ответы

Автор ответа: Murrmeow8
5

Ответ:

у рыб в сердце 1 желудочек и 1 предсердие. в сердце только венозная кровь

у земноводных предсердие разделяется перегородкой. в таком случае сердце имеет 2 предсердия и 1 желудочек. кровь смешивается

у птиц сердце четырехкамерное: 2 желудочка и 2 предсердия, кровь не смешивается

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The problem
of learning foreign languages is very important today. Students should learn
foreign languages. They became important especially at the present time.
Foreign languages are needed as the main and most efficient means of
information exchange between the people of our planet.

Today
English is the language of the world. Over 350 million people speak it as a
mother tongue. The native speakers of English live in Great Britain, in the
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It is the
major international language for communication in such areas as science,
technology, business and mass media. English ought to be used as one of the
official languages of the United Nations Organisation and other political
organisations. It is the language of computer software, literature, education,
modern music, international tourism.

Learning a
foreign language is not an easy thing. It is a long and slow process that takes
a lot of time and patience. But every educated person, every good specialist
has to know English because it is absolutely necessary nowadays.

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people will help a lot. When learning a foreign language you are to learn the
culture and history of the native speakers. You may any foreign
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