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how DoEs thE proFEssor struCturE thE lECturEA．By CompAring thrEE DiFFErEnt liFE CyClEs oF thE ButtErFly.
B、By ExplAining EACh DEvElopmEntAl stAgE oF thE ButtErFly.
C．By introDuCing thrEE DiFFErEnt insECt spECiEs.
D．By ExplAining AnAtomiCAl FEAturEs oF thE ButtErFly.