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Book Basics Of Children S Sciences Botany

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Basics Of Children's Sciences - Botany
Qr Code Basics Of Children's Sciences - Botany

Basics Of Children's Sciences - Botany

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Category: The Basic Education [Edit]
Language: Arabic
Publisher:  دار الفكر للنشر والتوزيع
ISBN: 9789957073077
Release Date:
Pages: 96
Rank: 633,782 No 1 most popular
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يعتبر علم النبات احد الفروع الاساسية لعلم الحياة وقد ظهرت الكائنات النباتية لاول مرة قبل حوالي 3500 مليون سنة في مياه المحيطات ثم انتقلت الى اليابسة وتطورت النباتات خلال هذه المدة وتقدر ب 3.5 بليون سنة الى اربع مراحل: 1- مرحلة النباتات المائية ( الاشنات )، 2- مرحلة النباتات التريدية، 3- مرحلة النباتات عريانات البذور، 4- مرحلة النباتات مغطاة البذور: وهذه المرحلة تندرج تحتها اكثر النباتات تطورا وتعقيدا وتنتمي اليها جميع النباتات الزراعية. ومعظم النباتات العلفية والحرجية وتعتبر اهم مصادر الغذاء للمملكة الحيوانية.

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