A scientist is searching for a chemical that can change the characteristics a pea plant passes to its offspring. To do this, the chemical must affect
the pea plants in which of the following ways?

The four answers are there

the answer is c.) there is a warm front in region a and a stationary front in region b.

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.