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The three major classes of cnidarians are hydrozoans, jellyfish, and sea anemones and corals.
Usually not. Major classes are like Physics, Language Arts, Math etc.
the three major groups are crustaceans spiders and inscets
The major classes of nouns are common nouns (e.g. dog, city), proper nouns (e.g. Paris, McDonald's), abstract nouns (e.g. love, happiness), concrete nouns (e.g. table, tree), countable nouns (e.g. book, cat), and uncountable nouns (e.g. water, air).
three.. :) ..
Radar, Computers, Rockets
the major classes of materials
Computers, increased pace of living, and replacement of human services are three major effects of technology on everyday living.
Not clear on which 3 classes are the "major ones", but Polyplacophorans, Gastropods, and Bivalves have an open circulatory system while Cephalopods have a closed circulatory system.
Alkanes_CnH2n+2 Alkenes_CnH2n Alkynes_CnH2n-2
The three social classes in China under the Zhou dynasty are King, Nobles, and Peasants.
Six primary classes, three intermediate classes (Junior High) Three Senior classes.