Q1. Archeologists discover skeletal remains of humanlike animals in Ethiopia. Examination of the bones suggests that the remains represent four types of individuals. One of the skeletons has a bone density of 30 percent less than those of the other skeletons. The skeleton with the lower bone mass also has a broader front coxal bone. Within the other 3 skeletons, two have bones with evidence of epiphyseal plates, but largest one has only a thin line where the epiphyseal plates must be. Approximate the age group and gender (where possible) of the individuals in this find.

Q2. Aspirin has a pH of three. Some people who take large amounts of aspirin (for example, for arthritis) take a pill that combines aspirin with Maalox. What is the reason for this combination?