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سخن های زیبا - انگل ها چه هستند؟
 
سخن های زیبا
سه شنبه 15 فروردین 1391

 دانشمند هااااااااااا

انگل ها

انگل ها

انگل ها، موجوداتی هستند که غذای خود را از موجودات زنده دیگر تهیه می کنند. آن ها با ربودن غذای میزبان، اغلب باعث ضعف و بیماری او می شوند. البته، در انواع دیگر روابط، حیوانات مختلف می توانند به یکدیگر نیز کمک کنند. برای مثال، نوعی خرچنگ دریایی به نام هرمیت، شقایق دریایی را در پشت خود حمل می کند تا هنگام احساس خطر، خود را در زیر شاخک های گزنده اش پنهان کند؛ در عین حال شقایق دریایی نیز از این کار سود می برد زیرا در غذای خرچنگ شریک می شود. مشابه این حالت، گونه ای از میگوها هم با ایجاد حفره ای در کف دریا با نوعی ماهی شریک می شود. ماهی از پنهان شدن در حفره استفاده می برد و در عین حال به عنوان دیده بان عمل می کند و نزدیک شدن شکارچی و متجاوز را به موقع به میگو خبر می دهد. بیش تر انگل ها، دارای بدنی با ساختار بسیار ساده هستند، زیرا به اندام های پیچیده برای هضم غذای خود نیاز ندارند. بعضی از انگل ها، صرفا انبوهی از اندام های تولید مثل هستند.

 





نوع مطلب : دانستنی ها، دانستنی های پزشکی ، اطلاعات پزشکی ، بیماری ها، 
برچسب ها :
لینک های مرتبط :
سه شنبه 27 شهریور 1397 12:25 ب.ظ
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پنجشنبه 17 خرداد 1397 08:36 ب.ظ
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چهارشنبه 5 مهر 1396 01:28 ق.ظ
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شنبه 1 مهر 1396 12:51 ب.ظ
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دوشنبه 21 فروردین 1391 11:30 ق.ظ
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