Do you wanna know how I got these scars? My father was a drinker...and a fiend. And one night, he goes off crazier than usual. Mommy gets the kitchen knife to defend herself. He doesn't like that. Not...one...bit. So, me watching, he takes the knife to her, laughing while he does it. He turns to me, and he says, "Why so serious?" He comes at me with the knife - "Why so serious?" He sticks the blade in my mouth - "Let's put a smile on that face!" And... why so serious?

What is the main structural difference between enveloped and nonenveloped viruses? a) enveloped viruses have their genetic material enclosed by a layer made only of protein.b) nonenveloped viruses have only a phospholipid membrane, while enveloped viruses have two membranes, the other one being a protein capsid.c) enveloped viruses have a phospholipid membrane outside their capsid, whereas nonenveloped viruses do not have a phospholipid membrane.d) both types of viruses have a capsid and phospholipid membrane; but in the nonenveloped virus the genetic material is between these two membranes, while in the enveloped virus the genetic material is inside both membranes.