Why humans don't have varieties like animal species in their functional organs?

Question

Only the color of skin is different, why not a totally different human being as in frogs, fishes etc.

Answer 1

There is less variation in humans than there is in other animals because our range of habitats is so wide. Most animals have a limited range of habitat, hence developed within it, and so would have become more separate from similar species, such as the differences between the lemurs of Madagascar - small habitat, no interaction.
When the first migration of humans (Homo erectus?) out of Africa occurred, about 500,000 - 700,000 years ago (not sure about dates), it resulted in colonisation of Europe by what would eventually become Neanderthals. A separation of humans into distinct groups then began to occur, such as you mention. The neanderthals of Europe and those left in Africa who became Homo sapien sapiens.
The two groups met again after the second migration about 100,000 years ago. The two groups, although they would look similar, did not interbreed. The Neanderthals became extinct about 30,000 years ago.
Otherwise, there would be two distinct groups of humans on Earth.
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Answer 2

I think you are a little mixed up with what a species means. A species is exactly a set of animals/plants/organisms that don't have any functional differences.

A frog doesn't belong to the same species of the fish. Infact there are several species within frogs and within fish.

So, if there were two humans with different functional organs under normal conditions.. well, one of them wouldn't be human anymore.. atleast as the biological definition of "homo sapien sapien" goes...

Answer 3

Take 10 people from different parts of the world and stand them in a lineup...

White American
Black American
African
Samoan
Oriental
Arab
Jamaican
Mexican
Indian
Irish/ Scottish

You can't tell me that the only difference that you can see is the color of the skin... Race is the human word for species!
These are totally different types of humans...

Answer 4

It seems that you are confusing two separate things. There are completely different species within the same genus, and then there are slight variations within the same species.
Humans have lots of slight variation: tall, short, fat, thin, blue eyes, green eyes, brown eyes, light skin, dark skin, etc...but overall they are essentially the same because they are the same species: Homo sapien sapien. There is (currently) no other species of human being, so there is no basis for comparison. All other species of humans, such as Homo sapien neanderthalensis, Homo habilus, and Homo erectus, are extinct.
However, when you look at frogs, to use your example, you have tons of different species of frog. So naturally, you see much more variation.
So, basically the (much simplified) difference between the questions you are asking can be express as asking "Why are there differences between poodles and German shepards?" vs "Why are these two German shepards not EXACTLY alike?"

Answer 5

Absolutely. We are just a step further up the evolutionary scale. To say otherwise is denying the proven facts. I am an Atheist but this has nothing whatsoever to do with my firm belief in this theory. As a matter of fact I had not given up religion yet when I adhered to this theory. As a scientist I prefer to check out every viewpoint before making up my mind and to do that well takes quite some time.

Answer 6

We are all one species and there aren't any other human species existing now. In most animal species there is not so much variation in the species. If you look at one species of frogs, you will see they all look quite much the same.

The species that is closest to our species are the chimps and you see they are quite different.

Answer 7

if that ever happened i think there could be different species of humans. we've never been isolated from each other long enough to develop that kind of variety. we keep procreating with each other so we continue to be more or less the same. i guess if you believe that humans and apes share a common ancestor then that would be an example for you.

Answer 8

I think there are different types. Look at Pygmy people. They are a different type of human. Also look at differences between European and, for example, Eskimo people. It is more than skin colour that makes them biologically different.

Answer 9

They do. But then you have to ask your self does an Horse identify itself with a donkey and do we identify ourselfs with primates. Its all just a matter of nomenclature but the amino acids in primates are very similar.

Answer 10

well,this is because we don't have the gene that codes for those characteristics.actually diferrent species have diferrent numbers of chromosomes,eg. orang utan have 47 chomosomes while human have 46.