When plaque becomes heavy and hardened, it is called dental calculus or _________.
1 answer:
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Answer:
Among Sponges and Cnidarians, the difference among given facts is in "Have a network of nerve cells".
Explanation:
Both Sponges and Cnidarians have pores, they reproduce by buddings, and they live in freshwater. The major difference in both organisms is that: cnidarians have very simple nervous system made of sensory nerves that are arranged in the form of neural network. On the other hand, sponges are simple multicellular organisms without any neural network at all. In fact, they are the only multicellular organisms (animals) without a nervous system.
