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THE IMPORTANCE OF BEING THE RIGHT SIZE - ORGANISMS AND SIZE
- Words:
- 739
- Submitted:
- Thu Mar 17 2005
Have a little read: ... THE IMPORTANCE OF BEING THE RIGHT SIZE Different organisms are of different sizes. If I take an example of two organisms such as an amoeba, which is a single celled organism and an elephant, which is a multicellular organism I can see that they are obviously of different sizes. AMOEBA ELEPHANT Since an amoeba is small it has a large surface area compared to its volume. Since an elephant is large its surface area is small in comparison with its volume. As can be seen below if one increases the surface area of an object, the total volume increases but the surface area: volume ratio decreases. 3cm 2cm 1cm Total SA= 6 24 54 Total Vol= 1 8 27 SA:Vol= 6:1 3:1 2:1 An amoeba exchanges with the environment by occurring across the entire body surface through the cell membrane. An elephant exchanges with the environment by taking in oxygen into
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