Предмет: Биология, автор: Lili700

Протоки пищеварительных желёз у рыб впадают в .. 1) желудок и тонкую кишку 2) толстую и тонкую кишку

Ответы

Автор ответа: pettys2002

Ответ:

Протоки пищеварительных желёз у рыб впадают в : 1) желудок и тонкую кишку

Lili700: я просто немного сомневаюсь, но желудок есть не у всех рыб(

pettys2002: Знаю, но в описании пищеварительной системы у рыб протоки пищеварительных желез поступают именно в тонкий кишечник

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Ecological Problems

Since ancient times Nature has served Man, being the source of his life. For thousands ofyears people lived in harmony with environment and it seemed to them that natural richeswere unlimited. But with the development of civilization man's interference in naturebegan to increase.

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Every year world industry pollutes the ahmosphere with about 1000 million tons of dustand other harmful substances. Many cities suffer from smog. Vast forests are cut andburn in.fire. Their disappearance upsets the oxygen balance. As a result some rare speciesof animals, birds, fish and plants disappear forever, a number of rivers and lakes dry up.

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