The urethra is identified by the letter . Human excretory system. Letters from A to E mark definite structures of this system. Letter A marks vessels that nourish a paired bead-shaped organ. Letter B marks a tube that goes from the bean-shaped organ to a sac in the pelvis. Letter C marks the sac in the pelvis. Letter D marks the bean-shaped organ. Letter E marks a tube that goes from the sac in the pelvis outside the body.

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.

if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it