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The correct option is A Sponges
Sponges, though multicellular, are made up of a collection of cells that function independently without any coordination with each other. They are different from other metazoans, because they have no nervous system and, therefore, there is no coordination between cells. The cells do not show tissue level organization and function quite independently.
Ctenophores have a nerve net but no brain or central nervous system. The nerve net forms a ring around the mouth.
Annelids, like earthworms, have a segmented body and each segment has cells specialized for control and coordination.
Cnidarians, like hydra, also do not have a brain but do have integrative areas of neural tissue that could be considered some form of centralization.
Sponges, though multicellular, are made up of a collection of cells that function independently without any coordination with each other. They are different from other metazoans, because they have no nervous system and, therefore, there is no coordination between cells. The cells do not show tissue level organization and function quite independently.
Ctenophores have a nerve net but no brain or central nervous system. The nerve net forms a ring around the mouth.
Annelids, like earthworms, have a segmented body and each segment has cells specialized for control and coordination.
Cnidarians, like hydra, also do not have a brain but do have integrative areas of neural tissue that could be considered some form of centralization.
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