That principle is that cells are derived from other cells.
Answer: A. Dimerization (1), DNA binding (4), cAMP binding (3
Explanation:
The number of legs that an arthropod has is a very useful characteristic for classifying them into different classes. Insects always have six legs<span> (three pairs) and arachnids have </span>eight legs<span> (four pairs). Crustaceans have at least </span>eight legs<span> and often more, while myriapods can have up to a hundred legs!</span>