Spittlebugs release foam to hide themselves in branches. what kind of adaptation is this? a) biochemical b) ecological c) structural d) physiological select the best answer from the choices provided a b c d

Which soil horizon, also known as the zone of accumulation, is enriched in clay, iron oxides, silica, carbonate, and other materials?

If you have a green turn signal light, you must before making your turn. a. check the crosswalk b. yield to cross traffic and check the crosswalk c. turn off your car's turn signal d. none of the above

Which of these is a disadvantage of hydrogen fuel cells? a. engines that use hydrogen fuel are more efficient than gasoline-powered engines. b. the only emission produced by hydrogen fuel cells is water. c. hydrogen fuel is continually available and useful for heating. d. hydrogen fuel is often purified in a process that emits lots of greenhouse gases.