Sometimes, the hot water produced by a solar water heater is not warm enough to meet the needs of the occupants of a building. A traditional water heater inside the building supplies additional thermal energy to the solar-warmed water. How can this method still reduce the overall amount of natural gas or electrical energy a building uses?

answer; (c) on the left side; ; ; ; ; ; ; ; ; ; ; ; ; speech is localized on the left side of the brain;

answer; migrate from a region;

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.