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NAZ NAZ
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13 years ago
1.List three characteristics of sponges that illustrate that they are an early branch of the animal kingdom.
2.If sponges are sessile, how are they able to disperse?
3.Which characteristic of sponges closely links them to choanoflagellates? Explain briefly.
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#1
Educator
13 years ago
1. They are filter feeders, they have a skeleton-like structure made of calcium carbonate, they exhibit growth, basically they are born they grow they reproduce and they die, which is a characteristic of all animals.

2. Cells are flagellated, this enables them to disperse.

3. There are specialized cells in sponges called choanocytes ("collared cells") which bear a great resemblance to choanoflagellates.
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#2
Educator
13 years ago
One more thing to add to number 1... Sponges lack true tissues, which is a primitive characteristics of early animals.
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