{{B}}nArrAtor{{/B}}
listEn to A pArt oF A lECturE in An ECology ClAss.

why DoEs thE proFEssor sAy this
A．to DEsCriBE thE importAnCE oF runoFF AnD grounDwAtEr.
B．to CompArE thE Amount oF runoFF with thAt oF grounDwAtEr.
C．to show similAritiEs BEtwEEn runoFF AnD grounDwAtEr.
D．to ExplAin how runoFF EvEntuAlly BEComEs grounDwAtEr.