| D011161 |
Porifera |
The phylum of sponges which are sessile, suspension-feeding, multicellular animals that utilize flagellated cells called choanocytes to circulate water. Most are hermaphroditic. They are probably an early evolutionary side branch that gave rise to no other group of animals. Except for about 150 freshwater species, sponges are marine animals. They are a source of ALKALOIDS; STEROLS; and other complex molecules useful in medicine and biological research. |
Demospongiae,Sponges (Zoology),Sponge (Zoology),Sponges,Poriferas,Sponge |
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| D002454 |
Cell Differentiation |
Progressive restriction of the developmental potential and increasing specialization of function that leads to the formation of specialized cells, tissues, and organs. |
Differentiation, Cell,Cell Differentiations,Differentiations, Cell |
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| D002816 |
Chordata, Nonvertebrate |
A portion of the animal phylum Chordata comprised of the subphyla CEPHALOCHORDATA; UROCHORDATA, and HYPEROTRETI, but not including the Vertebrata (VERTEBRATES). It includes nonvertebrate animals having a NOTOCHORD during some developmental stage. |
Invertebrate Chordate,Chordatas, Nonvertebrate,Chordate, Invertebrate,Chordates, Invertebrate,Invertebrate Chordates,Nonvertebrate Chordata,Nonvertebrate Chordatas |
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| D003063 |
Cnidaria |
A phylum of radially symmetrical invertebrates characterized by possession of stinging cells called nematocysts. It includes the classes ANTHOZOA; CUBOZOA; HYDROZOA, and SCYPHOZOA. Members carry CNIDARIAN VENOMS. |
Cnidarians,Cnidarian,Cnidarias |
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| D003584 |
Cytological Techniques |
Methods used to study CELLS. |
Cytologic Technics,Cytological Technic,Cytological Technics,Cytological Technique,Technic, Cytological,Technics, Cytological,Technique, Cytological,Techniques, Cytological,Cytologic Technic,Technic, Cytologic,Technics, Cytologic |
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| D004447 |
Echinodermata |
A phylum of the most familiar marine invertebrates. Its class Stelleroidea contains two subclasses, the Asteroidea (the STARFISH or sea stars) and the Ophiuroidea (the brittle stars, also called basket stars and serpent stars). There are 1500 described species of STARFISH found throughout the world. The second class, Echinoidea, contains about 950 species of SEA URCHINS, heart urchins, and sand dollars. A third class, Holothuroidea, comprises about 900 echinoderms known as SEA CUCUMBERS. Echinoderms are used extensively in biological research. (From Barnes, Invertebrate Zoology, 5th ed, pp773-826) |
Echinodermatas |
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| D005075 |
Biological Evolution |
The process of cumulative change over successive generations through which organisms acquire their distinguishing morphological and physiological characteristics. |
Evolution, Biological |
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| D000818 |
Animals |
Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. |
Animal,Metazoa,Animalia |
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| D000845 |
Annelida |
A phylum of metazoan invertebrates comprising the segmented worms, and including marine annelids (POLYCHAETA), freshwater annelids, earthworms (OLIGOCHAETA), and LEECHES. Only the leeches are of medical interest. (Dorland, 27th ed) |
Segmented Worms,Worms, Segmented,Annelidas,Segmented Worm,Worm, Segmented |
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