กระบวนการเติบโตของสิ่งมีชีวิต

1. การเพิ่มจำนวนเซลล์ ใน สิ่งมีชีวิตเซลล์เดียว การแบ่งเซลล์ถือว่าเป็นการสืบพันธุ์ เกิดชีวิตใหม่ขึ้น มี หลายแบบ เช่น การแบ่งแยกตัวเป็นส่วนๆ การแตกหน่อเป็นต้น ในสิ่งมีชีวิตหลายเซลล์ การแบ่งเซลล์เป็นการเพิ่มจำนวนเซลล์ให้มากขึ้น เช่น การแบ่งเซลล์จากตัวอ่อนเป็นตัวเต็มวัย สร้างเซลล์ใหม่เพื่อทดแทนเซลล์เก่า เช่น เซลล์ผิวหนัง
2. การเพิ่มขนาดของเซลล์ หมาย ถึง กระบวนการสะสมและสังเคราะห์สารอินทรีย์ภายโมเลกุลของเซลล์ ทำให้โมเลกุลมีขนาดใหญ่ขึ้น หรือมีการรวมกันระหว่างโมเลกุลกับโมเลกุล เป็นผลให้เซลล์ต้องขยาย ขนาดตามไปด้วย จึงเกิดการเจริญเติบโตของสิ่งมีชีวิต เช่นงูจะมีการลอกคราบเมื่อมีขนาดตัวใหญ่ขึ้น
3. การเปลี่ยนแปลงสภาพของเซลลทั้ง รูปร่าง และหน้าที่ของเซลล์เนื่องจากในระยะแรก เซลล์อาจจะทำหน้าที่อย่างหนึ่ง แต่เมื่อมีการเปลี่ยนแปลงหน้าที่การทำงานจึงเกิดการเปลี่ยนสภาพเซลล์ ตามไปด้วยเพื่อให้ได้เซลล์ที่สามารถทำหน้าที่ที่ต่างกัน การเปลี่ยนสภาพเกิดทั้งทางกายภาพและชีวเคมี ทั้งในระดับโมเลกุล ระดับเซลล์ ระดับเนื้อเยื่อ ระดับอวัยวะ และระดับระบบอวัยวะ เซลล์ที่ได้ใหม่ จะมีลักษณะแตกต่างไปจากเซลล์เดิม
4. การเกิดรูปร่างที่แน่นอน สิ่งมีชีวิตจะมีการเปลี่ยนแปลงรูปร่างตลอดเวลาตั้งแต่แรกเกิด จนเป็นตัวเต็มวัย เนื่องจากมีการแบ่งเซลล์ หรือเพิ่มจำนวนเซลล์ รูปร่างตอนโตอาจจะแตกต่าง จากตอนแรกเกิดมากหรือไม่เหมือนกันเลย เช่น กบ ผีเสื้อ เป็นต้น การเติบโตในสิ่งมีชีวิตชั้นสูง จะหยุดเมื่อโตเต็มวัย โดยการใช้ความสูงที่หยุดเป็นเกณฑ์ ไม่คำนึงว่าน้ำหนักจะเพิ่มหรือลดลง

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