Hiv shows a high degree of variability because:
a. hiv is derived from many different strains of monkey viruses
b. hiv has been infecting humans for a long time
c. prolonged use of anti-hiv drugs results in resistance
d. the enzyme responsible for copying the genetic information of hiv from rna to dna is
error prone
e. all of above

propane is burned to provide the heat in many cooking grills. the chemical reaction for this process is shown in the equation below.

c3h8 + 5o2 ? 3 co2 + 4h2o + energy

what are the products in this chemical reaction?

3co2 + 4h2o + energy

answer/// to address the needs of adults with mental illness and increase their ability to function;