Examlex
Which of the following is an example of a positive externality?
Ecdysozoa
A branch of the protostomes that includes animals that molt, such as the rotifers, nematodes, and arthropods.
Protostomes
A group in the animal kingdom characterized by the mouth developing before the anus during embryonic development.
Coelom
A fluid-filled body cavity found in most multicellular animals that is lined by tissue derived from mesoderm.
Flatworms
A group of invertebrates known for their flattened bodies, belonging to the phylum Platyhelminthes.
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