I get all that, I was speaking from a purely biological point of view. Anyway, you an Ultramarine fan??He is ignorant dumb-bit fool, cold weather is not the ideal place for sustained civilisation in olden times as the time to grow food-grains were limited.
Thats why we dont see any old civilisation ever developed in colder climates of Earth.
These places are surviving now due to trade if trade is switched off colder countries will not be able to sustain the population.
In majority arable lands of India the lands produce multi seasonal food products which is not the case in most of the arable lands in planet.
Thats why India sustained civilisations carrying millions of people thousands of years old some of these civilisations continuous so we cant find how ancient they are only dead civilisations leave footprints like Egypt, Harappa.
One example is Tamilnadu where in every season food production is possible no risk of warer scarcity. Here in some temple same Mantras can be heard today as 10000 years before.
India is mother of civilisation and more ancient than the word ancient.