QUOTE (danielost @ Jun 13 2008, 10:02 PM)

The problem is that humans don't change to fit the environment. We change the environment to fit us.
I would agree that we are pretty darn handy at modifying our environment - yet there are always variables we can't control, or we try to but haven't to date been entirely successful. I have read that there are certain genes that seem to offer some protection to HIV that have been gaining in frequency. It mentions it here, but the whole article is quite fascinating.
http://www.newscientist.com/channel/being-...l-evolving.html It also discusses how our modification of the environment may lead in terms of evolution.
QUOTE (danielost @ Jun 13 2008, 10:02 PM)

By the way do not tell me that light skin is evolution to adapt to less sunlight.
because there are groups of people who live further north or south than the eurapeans do who are dark skinned. and according to science they have lived there longer.
Like Cimber said skin colour generally follows the environment, but if you take into consideration other factors - things still make sense:
http://encarta.msn.com/encyclopedia_761576599_4/Race.html"In support of this argument, many populations of tropical areas—where solar radiation is most intense—do have dark skin. For example, indigenous people in tropical Africa, Australia, and parts of India and the South Pacific have very dark skin. However, inhabitants of tropical Central and South America have much lighter skin than these populations. Although the reason for this difference is debated, native Central and South American populations usually live in forest areas, where shadows from trees considerably reduce their exposure to solar radiation. Moreover, forests are very humid, a factor that also decreases the intensity of ultraviolet light. Thus, African Pygmies and, to a lesser extent, other Africans who also live in forest areas are lighter in skin color than Africans who live in unforested areas. Darker skin is more often observed in tropical savannas and deserts."
Think of this as well Daniel, if you take a train trip from Moscow to Shanghai – along the way look at the different skin colours and features – is there a sharp divide? Nope blends….slowly over the train ride you will notice subtle shifting of colours and features. What do you think that alludes to?
QUOTE (danielost @ Jun 14 2008, 09:22 PM)

Can I throw a monkey wrench into the whole marcoevolution theory. What if when God made the Earth he made man first and modeled the animals after man.
This could explain why whales have five digits in their front flippers.
Using God as an explanation always throws up more questions than it answers.
QUOTE (danielost @ Jun 14 2008, 09:24 PM)

Lets look at Lucy and her immidiate ancester. The ancester had a bigger brain but did not walk upright.
What are you saying? That therefore evolution isn't happening? Something to do with bipedalism?
Evolution meanders in response to a variety of factors - humans could get smaller brains etc and would that mean that we weren't the predecessors? No wouldn't do anything of the sort.
Also here is a silly example I made up for ya. It just shows how there are so many factors involved in finding fossils etc that you really have to think of many variables when discussing and working out lineages.
Imagine if in the future people dug up a Norse man from 1500s and an Australian girl from 2000. What would be the general inferences? Well Norse man is bigger, longer limbs, perhaps a bigger brain to weight ratio. So are we going to infer that further back you go populations were bigger and we are now decreasing in size? Well admittedly you would want to have a more to work with to come up with conclusive answers.
So what do we do? Throw our hands up –
nope we see how this information fits in with things we can observe now – such as sexual diamorphism. Also environmental factors pertaining to the life of Norse man and the life of Australian girl, look at what other variables were at play et cetera et cetera et cetera. I admit new finds sometimes appear anomalous, but all they usually do in the long run is increase the complexity and depth of understanding we have. It never reverses into Genesis.
We can also see other peices of evidence that give us confidence we are on the right track with our studies of the past. Such as DNA analysis – complements the picture – so does the ‘evolution’ of stone tool kits. THEY ALL FIT TOGETHER AND TELL THE SAME STORY. Multiple strands, compare, contrast - past, present
tell the same story. Even the study of languages fits in with DNA analysis and archaeological finds.
So you may say ‘Lucys ancestor had this"
(where is that info from btw?!??Are you talking about Mr Furphy Contraversy himself, Homo rudolfensis?)But what you are looking at really is general trends - of many things as well as brain size. If we examine the femur throughout evolution - it may meander backwards and forwards in size relative to rest of body etc etc.
But there are usually general trends. The more things we find, the more it fills in the picture. It is not absolute by any means, but what we have now FITS THE EVIDENCE BEST.(if you want I will explain the brain size/weight/ratio/evolution thing in more detail, it certainly is an interesting general trend with pretty neat implications) Who doesn't love that our brains have gotten bigger, I ask!
So, to be honest we are still filling in the picture with human evolution - but no little snippets of information throw a spanner in the works. These little snippets you throw up all have explanations or are not the break of evolution that you think they are. But I think it is great you take an interest in them! It is a fascinating subject, hey