Which of the following appeared during the mesozoic era?
a.
birds
c.
mammals
b.
dinosaurs
d.
all of the above

South america is located within which hemisphere?

The oil and gas found in the middle east are regulated by a. organization of petroleum exporting countries b. southwestern asian oil refineries c. north atlantic treaty organization

Which of the timelines above correctly shows the order of historical events on the african continent? a. one (1) b. two (2) c. three (3) d. four (4)