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how DoEs thE proFEssor ExplAin thE liFECyClE oF ButtErFliEs
A、By FoCusing on whAt thEy ArE likE in thE EmBryo stAgE.
B、By DEsCriBing thEir DEvElopmEnt in ChronologiCAl orDEr.
C、By CompAring it to thE liFECyClEs oF othEr insECts.
D、By DisCussing thE migrAtion routEs FollowED By monArChs.