Which of the following statements is correct?
a.
one met is equivalent to the energy (oxygen) used to participate in vigorous-intensity physical activity
b.
3-6 met is equivalent to the energy (oxygen) used to participate in moderate-intensity physical activity
c.
7 met is equivalent to the energy (oxygen) used to sit quietly and read a book
d.
all of the above

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.