Research has shown that if a prescribed course of antibiotics is not completed that some bacteria may survive and the infection may return. How can natural selection or survival of the fittest be used to explain this happening?

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

the answer is sex-linked recessive.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.