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| phylum of worms with bilateral symmetry and soft, usually flattened bodies |
| vertebrate with body hair that nourishes young with milk from mammary glands |
| altricial (āl-trĭsh'əl) Pronunciation Key
Born or hatched in a helpless condition requiring prolonged parental care, as by being naked, blind, or unable to move about. Nesting birds, monotremes, marsupials, and carnivores have altricial young. Compare precocial. |