The amalgamation of HFC-134a with a high concentration of air at elevated pressure can turn combustible in the existence of an ignition source, that is, an oxygen-enriched environment. Thus, at high-pressure condition in the presence of oxygen in a mobile air conditioning system results in combustible HFC-134a.
Horses have 64 chromosomes and donkeys 62, so when the two breed their mule offspring ends up with 63. Because this is an odd number, it's impossible for them to divide evenly into two. That means the mule cannot produce sperm and egg cells that carry exactly half the animal's chromosomes, as should happen.Aug 28, 2018
The answer is physically fit older people. this is because ageing causes changes to the brain size, vascalature and cognition. Brains shrinks with increasing age and there are changes at all levels of molecules morphology.