How are the ages of extinct organisms determined? A)by measuring how much the fossils’ appearance has changed
B)by studying the hardness of their fossils
C)by studying the concentration of radioactive atoms in their fossils
D)by counting the number of fossils known for a species

Considering the case of the two health clinics above, why do you think that trouble was brewing? there was serious competition for tech jobs at the downtown clinic. the new technology at the uptown clinic was too difficult for the staff to understand. the doctors pitted the staff of one clinic against the staff at other clinic. the staff at the downtown clinic saw that their colleagues at the uptown clinic were treated better and had more opportunity.