Longer answer: Skin must be exposed to sunlight to modify cholesterol in the dermis and produce vitamin D (used to absorb Ca++). This is a photon/radiation based reaction. Therefor someone with dark skin in a low light level climate will die for lack of vit. D production. Except now its in most milk, cereral,etc... Therefor to get vit D in low light levels you need light skin color to allow the photon to past into the dermis and catalyze the reaction and make yourself some vitD
Thanks. This could be labelled as environmental conditioning. This is what many people forget to take into consideration. It isn't whether a cow can grow wings and fly it's about whether they need to or not. Everything adapts in accordance with the environment. Evolutionary changes occur due to this, not because they can- but because they need to.
People around the world have different skin tones based on the level of sunlight and heat because its an essential to survival. In modern perspective a child born to dark skinned parents will himself be dark skinned- the genes have adapted in advance. Luckily as mentioned we now consume matter that contains vitamins we need anyway, but in the old days of roasting cows legs day after day it had purpose.
Spiders in england spin a web in a corner and wait for something to fall into it.
Some spiders in Australia hang upside down and twirl goo on their legs which makes a sound identical to the type of moth they eat. Another spider looks identical to the ant it eats- but of course has one problem that it has 8 legs and not 6... However the ant has two antennae. The spider uses its two front legs as fake antennae and walks along with the ants who are clueless.
Many species of animal, (mainly insects), have adapted to such extremes- threatening skin colours, defensive mechanisms such as poison, light strobes etc again because they need to in order to survive.
A spider in england has no need to swing goo for moths and no need to look like an ant- so it doesn't. If there is a need to adapt and evolve due to environmental situation creatures will, over time, change in order to prolong their survival.
Some frogs who are known to be overly numerous in female numbers have adapted so they can change sexual orientation to suit the survival needs of that species.
It is overwhelmingly apparent things do change, adapt and evolve- and if that ability exists now what makes you think it hasn't always been that way?
Humans work in the same manner- environmental need...
Look at tribal people who live in the rainforest naked. You try that, you'd be dead within a week, but these people survive and flourish for they have adapted to suit the environment.
There is absolutely nothing to assume an all powerful being who had a jewish son created us but that the land itself and the environment that evolved did so in order to survive and in order to expand. You could say: "What makes something want to survive?" But then it could be questioned why you don't just go and kill yourself. We live to live, not to die.
The environmental condtioning is added to by interbreeding and subtle gene differences that carry on to the next generation. For example if you take an african man and a white woman they'd give birth to a person referred to as 'half-caste'. In doing so and entirely new strain of 'creature' is formed. Colour is not the only issue..... we can talk of differences in bone structure and so on. Some will be passed on and so on and so forth..
The only real issue that causes any problems with anything is: "well how did it all start?"
The fact is we do not know, none of us. Making assumptions based on ancient texts is actually worthless. By looking at what we know, see and can test we move further to finding answers. By guessing and having faith we just stop moving altogether.
