Which kind of tissue is designed to regulate temperature, secrete lubricants and protect the body from harmful substances

The correct answer is epithelial tissue.  

The epithelial tissue is designed to secrete lubricants, regulate temperature, and safeguard the body from the harmful substances. These tissues line the outer surface of the organs and the blood vessels all through the body and on the inner surface of the cavities.  

The epidermis is an example of epithelial tissue. Some of the major activities of epithelial tissue comprise transcellular transport, selective absorption, secretion, and sensing.  

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.