One reason the skeletal system is important is because

a.
without the skeletal system, an individual would not have enough calcium to live
b.
the skeletal system creates the connective tissue and tendons that allow the body to move
c.
the skeletal system is solely responsible for housing the body's immune system
d.
the skeletal system is responsible for controlling functions of the entire body

Aperson who doesn't have enough calcium in his or her diet is at risk for developing bones that are weak and break easily. this condition is known as  a.  osteoporosis.    b.  crohn's disease.    c.  celiac disease.    d.  hemophilia.

Identify two ethical principles that can teens deal with difficult decisions

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.