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Size Not all daphnia are the same size. The largest species is Daphnia magna. It can grow up to four millimeters long. The smallest type is daphnia pulex, usually too small for the human eye to see. A basic full-grown daphnia is slightly larger than a newly hatched brine shrimp, and twice as large as a full-grown rotifer. Circulation For an advanced body, its circulatory system is very simple. A daphniaís heart beats very rapidly. This is because itís so small. The smaller the animal, the faster the heart beat. If you were able to hear a mouseís heart beat, it would be a high, humming sound, where an elephantís heart would sound like slow thuds.
Approximate Word count = 464
Approximate Pages = 1.9
(250 words per page double spaced)
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