I think this is an excellent question. I am not an expert but my guess is that it must be something to do with the physical properties of materials which behave differently at different temperatures. Fatty substances become more fluid as they get warmer leading to a change in behaviour, from this I'd assume that the nervous system must have, as part of it, some thermo-reactive substance which are part of a causal chain which modify various electro-chemical signals in the brain.
To put it another way, the brain must 'know' that specific changes in signal quality from nerve endings are compatible with changes in temperature. A process which may be surmised from how we can asses the ambient outdoor temperature simply by recognizing behavioral signals of elements in the environment: Mist, frost, etc. Such experiences must also affect neurologically measurable chemical changes in our nerves.
Yes the dogs recognize their siblings because they all have something same about or on their body
Antigen
You can recognize a counterfeit Cold Steel Knife by looking at the sheath. The sheath should be a sturdy quality piece. If it is not, it is a counterfeit. The lock should be sturdy and the blade should not wobble. If it is not, it is a counterfeit.
I'm not sure what you mean by body defenders but T-cells are the ones that recognize the enemy. The white cells get that and they kill the virus, bacteria, etc.
the T-cells recognize the enemy and sends the information to the white blood cell which kills it
I
To help the spirits recognize the body
by the scar on his body.
cold
cold
Our body temperature is high then cold water so when it comes in contact with our body energy in the form of heat is transferred from body to water so it decreases our body temperature and we feel cold.
the body is cooled when you eat cold ice or when you go to a place that is cold