Which of the following are true about our body's systems? (Select all that apply) More than one answer
A The nervous system sends messages to the body.
B The digestive system helps carbon dioxide leave the body through the lungs.
C Blood cells are a part of the circulatory system.
D The digestive system helps break down food into energy.

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.