Which physical characteristics have played a role in the environmental problems of north africa and southwest asia? choose all that apply.

a. abundant soil nutrients
b. desert ecosystems
c. petroleum resources
d. plentiful precipitation

Rectangle qrst is shown. angle qrt is congruent to angle str, and angle str is complementary to angle qtr. which statement is true about angles qrt and qtr? they are congruent. they are complementary. they are supplementary. they are right angle