Differentiate exotoxins and endotoxins in the following aspects (5 points): 

Source – Which types of bacteria produce each?

Chemical composition – What are they made of? 

Heat stability – Are they heat-stable or heat-labile?

Toxicity and lethality – Which is more potent and lethal, and why?

Mechanism of action – How are they released? How do they cause damage to host cells?

Examples of diseases – Name at least one disease caused by each.