If you knew what a disease was, you'd know that they are things that harm or kill people. Then you'd know why the body needs to protect against them.
The turtle doesn't need anything to protect itself it just has its own shell to protect itself. The turtle gets in its shell and stay there until the enemy is out looking for new preys
to provide heat to itself, protect itself from predator, and adapt to nature
singing
Antibiotics help to relieve pain and to fight and help the body to protect itself from infections and diseases by stopping the microbes, viruses and certain bacteria from entering your system.
Ravens protect themselves by flying away from their enemies. Ravens also use their beak to protect themselves when they need to.
Sweat
No. It's just got markings that is good enough to camouflage it in the water and the reeds. It doesn't need camouflage to protect itself, since it is a top predator.
It maybe felt territorial and felt a need to protect itself.
helps protect the body against bacteria
So that there will not be any deformities in the body
I guess when it feels threatened... Not quite sure what you mean by the question?
because they don't want to burn themeselves from the suns heat