আধুনিক শ্রেণিকরণ পদ্ধতিতে অ্যামিবা ও মাশরুম কোন রাজ্যের অন্তর্গত, এদের বৈশিষ্ট্য লিখ।
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Shape of Red Blood Cells. Erythrocytes are biconcave discs with very shallow centers. This shape optimizes the ratio of surface area to volume, facilitating gas exchange. It also enables them to fold up as they move through narrow blood vessels.
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