Well recall we breath in oxygen, but release carbon. Carbon is the answer.
Answer:
The skin produces sweat and oil.
*the skin acts as a barrier*
Explanation:
The skin does not identify and coordinate a response, that would be the immune system. The skin doesn't make mucus, the nose does that. The skin also does not make antibodies, the immune system does that.
It is a form of preparation for the unexpected
Answer:
One of these specifications is a characteristic known as rifling, which refers to the spiral lands and grooves placed into the firearm's barrel to impart a spin on the bullet for accuracy. ... Examiners generally test fire into a water recovery tank to obtain comparison bullets for evaluation under the microscope.