In sexual reproduction, offspring are genetically different from the parents. this is because

combined genes are received from both parents.

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!

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.