5. The greenhouse effect, deforestation, and acid precipitation are a few problems confronting people in the twenty-first century. These problems indicate which of the
following is needed in human societies?
a. The development of auto industries in developing nations
b. A reduction in reforesting efforts in certain regions
c. Cooperation between nations to reduce pollution.
d. An increase in the worldwide production of oil

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project

d. changes in climate and historical records

hope this