Astructure made up of two or more kinds of tissues that perform a special function is an

Organ. They do many special things that help us work right. Hope this helps.

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.

i think its white blood cells

i hope this