If the concentration in the sample tube is 50 ng/ml what is the concentration in tube 3. NO LINKS

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.

10alcohol affects the brain, reducing a person's ability to think clearly. the driver may not and actually feel he/she is performing better than they actually are.

Bacteria can cause different infections, check all that apply. a. sore throat b. measles c. ear infection d. flu e. cavities