Can someone answer this 2 questions for me please I need help with them

12. False

13. second answer

Explanation:

12. survival of the fittest does not refer to the physical strength if an organism but rather the ability of an organism to adapt to it's environment and reproduce.

13. The organisms do not really change over time but rather organisms with those specific traits reproduce and pass on those traits to the new generation.

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.