Sickle cell disease is caused by a
a. change in one dna base.
b. change in the size of a chromosome.
c. change in two genes.
d. change in the number of chromosomes in a cell.

Which step in healthy decision making requires you to look at the decision you made and determined whether different actions would have produced different results

What a self improvement for a busy person who had difficulty finding time to exercise/ dropping out of clubs and activities/ refusing social invitations from friends/ scheduling daily invitation activity/ sleeping fewer hours at night

Which behavior of an expectant mother is unhealthy