Two organisms live in aquatic environments. One has a hard, spiny covering on its skin and radial symmetry, while the other has a soft body with a hard protective shell and bilateral symmetry. Which classification best describes these organisms?
1 )
Both are molluscs
2 )
Both are echinoderms
First is an echinoderm; second is a mollusc
4 )
First is a mollusc; second is an echinoderm
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