AAA-TTT
T pairs with A.
A pairs with T.
A rock is a solid mass of geological materials. It is a natural mass of mineral matter that makes up the earth's crust.
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The slide of stages in starfish development illustrates stages from unfertilized egg to gastrula—typical of echinoderms and chordates that have very little yolk in the egg. Three embryonic cell layers—ectoderm, endoderm, and mesoderm—are established. All adult tissues are derived from these layers.
