Which of the Earth’s spheres is made up of the gases and air that surround the Earth and sustain life? A.
the hydrosphere
B.
the lithosphere
C.
the biosphere
D.
the atmosphere

Which of the following is not permitted in a roundabout? a. using your turn signal b. following the rules of right-of-way c. driving at the speed limit d. changing lanes

A. describe the model of urban structure most often observed in mega-cities in developing countries. explain how this model differs from common urban structures in north america. b. describe at least two factors leading to the growth of mega-cities in developing or least-developed countries. c. identify and explain two factors that led to the formation of squatter settlements in mega-cities in developing countries.

What member of staff does a patient see to have her teeth cleaned