Examlex
The simplest animals with a closed circulatory system are:
Phylum
A classification level in the biological taxonomy that groups together related classes of organisms.
Phylum
A level of classification or taxonomic rank below Kingdom and above Class, used to group together organisms that share a common plan of basic structure.
Phylum
A level of classification or taxonomic rank below Kingdom and above Class, used to group organisms that share a basic body plan or significant characteristics.
Phylum
A rank in the biological classification system that is below kingdom and above class, used in the classification of organisms to group together related classes.
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