Individuals with hiv sometimes contract secondary infections that are rare in the rest of the population. this is because people with hiv
a. are unable to fight off these secondary disease-causing organisms.
b. are more frequently exposed to these secondary disease-causing organisms.
c. release hormones that attract the secondary disease-causing organisms.
d. release substances that increase the strength of the secondary disease-causing organisms

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.