Identify the true statement. Choose one: A. The troposphere is the highest layer within the homosphere and sits below the mesopause. B. The mesosphere is ozone-rich and convects as warm air rises and cold air sinks. C. The thermosphere has distinct layers of gases of different densities and therefore is called the heterosphere. D. Ozone is a trace gas that protects the Earth's surface from excessive infrared radiation.

[ou.01jthe greatest speed with which any physical object moves is 300,000 km/soundsec. which of the following has a speed of 300,000 km/sec? a.light in water b.light in vacuum c.sound in air. d. sound in water

Aplane cuts a pyramid as shown in the diagram. what is the shape of the cross section? a. a hexagon b. a pentagon c. a square d. a triangle

Astate's representation in the u.s. senate is based on a) equal representation. b) the state's population. c) the state's electoral votes. d) the size of their major cities.this independent regulatory agency was created in 1974 to oversee and regulate the financing of political campaigns in the united states. a) warren cthis independent regulatory agency was created in 1974 to oversee and regulate the financing of political campaigns in the united states. a) warren commission (wc) b) federal election commission (fec) c) equal opportunity commission (eoc) d) securities and exchange commission (sec)