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На примере одного из представителей кишечнополостных объясните , почему у животных встречается лучевая симметрия?
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Предмет:
Биология -
Автор:
eduvigisgnkh - 6 лет назад
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Ответы 1
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Например гидры. Они ведут малоподвижный образ жизни. С помощью щупалец , которые направлены а разные стороны как лучи, они способны добывать добычу со всех сторон и защищаться от врага.
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Автор:
romándcie - 6 лет назад
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Из данных слов составить предложения
1./hardly/had/up/when/loudly/phone/and/rang/alarmingly/the/he/got/.
2./words/looking/dictionary/she/me/the/instead/in/kept/difficult/up/them/asking/all/of/the/.
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A pleasant Sunday day off almost turned to tragedy for two families at Ladram beach last week-end.
The children in party had asked their parents to let them explore a bay situated at a distance. The parents hesitated but the children promised to be back within an hour. Soon they were climbing up the rocks and shortly afterwards were out of sight. They failed to notice the time passing, until the tide[1] was coming in quickly. Already the water was too deep for them to pass. The eldest of them was a good swimmer. Hi left the children sitting on the rock and swam back to raise the alarm. He struggled bravely in water and rushed to his parents at high speed.
The waves were already round the children’s feet when the parents saved them. Fortunately the alarm came in time.
1.Where was the bay situated?
A)very close
B)rather far
C)near the place, where the party was
2.When did the children promise to return?
A)in an hour
B)very soon
C)less then in an hour
3.Did the parents want the children to go there?
A)yes, they were eager
B)no, they were against it
C)no, they were not sure
4.When did they notice they were late?
A)when the sun began to set
B)when the children became hungry
C)when the sea became stormy
5.What did the elder brother do?
A)he swam back with his brothers
B)he sat on high rock until his parents came
C)he swam back to raise the alarm
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