the are Metals, Metalliods, Non-metals
Which of these is not of the three main classes of elements?Read more: Which_of_these_is_not_of_the_three_main_classes_of_elements
Three main classes are:MetalsNon metalsTransition elementsThey are present in periodic table.
The three main parts of an element are protons, neutrons, and electrons.
bivalves gastropods cephalopods
Turbellaria , Trematoda and cestoda
aliphatic, alicyclic, aromatic and heterocyclic compounds.
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igneous, sedimentary, and metamorphic
The three social classes in China under the Zhou dynasty are King, Nobles, and Peasants.
metalsnon metalssemi metals
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I think this is right nouns, verbs, and modifiers