Explain the challenges scientists face with mutating viruses and how they are trying to solve the *answer*scientists are creating vaccinations that prevent people from getting bird flu. if the virus mutates, a new vaccine needs to be made. the vaccine needs to be tested, which can be dangerous. it also takes a long time for scientists to know whether the vaccine works.

Are all toddler boys hard to pottytrain?

Which type of rehabilitative care would most likely use strength-training equipment?

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.