10. Which arrow or arrows represent reactions that demonstrate a
conservation of mass and energy? Explain your answer.

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.

14. which of the following codons code for threonine? a. ucg b. ugu c. cga d. aca

What might explain the real-world results, show in the graph to the right, for one class of twenty students? check all that apply.