A horse and a donkey mate to produce an offspring that is not fertile. What explains the relationship between a horse and a donkey?

A. Horses and donkeys belong to similar species.

B. Horses and donkeys belong to the same species.

C. Donkeys are completely unrelated to horses.

D. Donkeys are horses with some adaptations.

youre right there are

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

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.