Fosilak
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![Page 1: Fosilak](https://reader035.fdocumento.com/reader035/viewer/2022062216/558bcfb4d8b42a960b8b4781/html5/thumbnails/1.jpg)
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Zer dira fosilak?
-Aspaldiko animalia edo landeeren aztarnak harri bihurturik
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Nola sortzen dira fosilak?
![Page 4: Fosilak](https://reader035.fdocumento.com/reader035/viewer/2022062216/558bcfb4d8b42a960b8b4781/html5/thumbnails/4.jpg)
Prozesua
Bost pauso daude:
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1.Animalia hiltzen denean lokatzaz betetzen da.
2.Animaliaren alde ahulak deskonposatzen dira.
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3. Gero hezurrak bakarrik geratzen dira.
4. Euria, haizea eta lokatzarekin fosila kanporatzen da.
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5.Azkenean, paleontologoek aurkitutakoa aztertzen dute.
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Zer dakigu fosilei esker?
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Zer esaten digute hezurrek?
-Animaliaren tamaina eta adina.
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Zer esaten digute gorotzek?
-Animaliek zer jaten zuten.
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Azalak zer esaten digu?
-Animalia zaurituta zegoen ala ez.
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Arrautzek zer esaten digute?
-Arrautzek osorik baldin bazeuden esan nahi zuen: denbora gutxi egon
zirela kumeak kabian.
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200.000.000 urte dituzte
GAUR EGUNGO BARRASKILOEN ANTZEKOAK DIRA BAINA
ITSASOKOAK
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245 milioi urte dituzte.
Itsasoan bizi ziren.
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Erretxina denbora pasa ahala anbar bihurtzen da
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2 milioi urte inguru dituzte itsasoan bizi ziren.
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Termino honek latinean du jatorria, eta “hiru lobulu dituena” esan nahi du. Izen hori Paleozoikoaren amaieran desagertu ziren artropodo itsastar batzuei ematen zaie. Lehenengo trilobiteak Kanbriar aroan agertu ziren, duela 590 milioi urte inguru, eta erdi Permiarrean desagertu ziren, orain dela 255 milioi urte, gutxi gorabehera.