Which statement best describes the benefits of muscular fitness training? a. high levels of muscular fitness can improve your self-image and improve or prevent chronic diseases such as diabetes, osteoporosis, and cardiovascular disease. b. low levels of muscular fitness also translate into low levels of back pain, injury, and chronic diseases like headaches and osteoporosis. c. low levels of muscular fitness will decrease your chances for sarcopenia and increase your chances of some chronic illnesses. d. high levels of muscular fitness translate into high levels of diabetes, osteoporosis, and chronic injuries that cause back pain.

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.