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or something in between. My question is if we evolved, why is there not a simple form of us walking out of the sea every so often. Or all different forms of us in different stages of evolution. Evolution couldn't just stop at some point, as that makes no sense. This is where the theory of evolution hits the road. Isn't it??

2007-11-02 13:41:23 · 11 answers · asked by knowitall 3 in Science & Mathematics Biology

11 answers

These are legitimate questions.
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Evolution does continue today. In our lifetimes, we can witness it only in life forms which reproduce very quickly, like bacteria. Evolution explains how random mutations sometimes help life forms to survive when faced with a new challenge. In the case of bacteria, the new challenge was the use of certain types of antibiotics. Those indviduals that had the lucky mutation were able to out-compete those that didn't. Now we have drug-resistant bacteria.
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As far as little critters crawling up on shore for the first time, it's likely they are, somewhere. Lakes are drying up, water is getting polluted worldwide. Remember, it's a long, long process. Aquarium fish in a dirty tank come to the surface to gulp air, wild fish do the same thing. Other fish alive today can crawl on land just enough to get to the next muddy puddle. The process continues.

2007-11-03 17:21:32 · answer #1 · answered by Stacy 3 · 2 1

Life never evolved from "dirt". Rather from organic molecules in the early earth.

First, you really need a feel for the kind of time involved.
- From non-living organic molecules to first one-celled life: 1 billion years (1,000 million years).
- From first cell to first multicellular life: 3 billion years (3,000 million years).
- From first multicellular life to animal life on land: 650 million years.
- That puts all land animal evolution in the last 360 million years.
- Split between humans an other primates (about 3-5 million years ago).

So the idea of a "simple form of us" emerging from the sea would not add up ... as the last primitive "form of us" that emerged from the sea was over 350 million years ago.

Second point, life evolves ... but it does not have to evolve in the direction of *humans*. So there is no reason any other living organism on the planet would continue to evolve to be more like us. No reason at all.

Third point, there is no reason "different forms of us in different stages of evolution" would exist. A species either evolves *as a species* or it splits into separate species. Thus once humans branched off from the primates ... they only interbreed with other humans ... so there would not be any "different stage" of us still around. The other branches of primates continued to evolve in very different directions to become the primates they are today. (Which are NOT some sort of intermediate stage of human evolution ... they are completely different branches, that have taken different paths, and will NEVER become human.)

Finally, you wrote:
>" Evolution couldn't just stop at some point, as that makes no sense."
That is absolutely correct. Evolution doesn't "just stop" ... it's just VERY VERY SLOW.

2007-11-02 15:01:19 · answer #2 · answered by secretsauce 7 · 4 2

Gosh. Anybody would think you were a christian. It's hard to know just where to start but perhaps:-

1. Read up on evolution so that you'll KNOW that your argument is ridiculous,
2. Talk to people who understand evolution, rather than believers.
3. Essentailly, conditions change, as I'm sure you're aware, and life forms change to suit those new conditions. Basic Darwinism
4. If you go and look along any muddy estuary at low tide you'll find a lot of simple forms of us. They're called Amphioxus.
5. Evolution HAS stopped for humans, and you may be right about it not making any sense.
6. Why must evolution hit a road? And which road?

2007-11-02 13:49:12 · answer #3 · answered by Tom P 6 · 3 4

1

2017-01-28 02:51:54 · answer #4 · answered by Brandon 4 · 0 0

The bacteria and components of living beings were not originally in the dirt.

2014-06-08 01:33:09 · answer #5 · answered by Ahmad 1 · 0 0

Every so often?

Do you even know how long evolution takes?

Evolution doesn't stop. Nor are there going to be different stages of us walking around because evolutions TAKES A LONG TIME. Nor does evolution happen in individuals. It happens in species in order to affect the entire gene pool. One organism doesn't evolve, the whole species does.

2007-11-02 13:46:11 · answer #6 · answered by Lady Geologist 7 · 3 3

The other forms have long since gone extinct. Also, other animals don't tend to evolve into niches already filled; natural selection occurs based on the present environment, which has changed from the past. So you don't see the transition from fish to amphibian again, since amphibians already exist.

2007-11-02 14:02:02 · answer #7 · answered by yutgoyun 6 · 4 1

There are simple forms all about the earth. They are all related to you, though many times removed. Think of a great bushy bush that sprung from one or very few forms. Some branches die, but the bush is so spread out and interconnected that it gives rise to the unity and diversity of life.

Knowitall? I do not think you know all that much. Go here.

http://www.talkorigins.org

http://www.aboutdarwin.com

2007-11-02 15:00:06 · answer #8 · answered by Anonymous · 1 2

Actualy your argument breaks it's focus when you say that humans have stopped evolving... the truth is that humans are getting smaller, losing our hair, becoming physicaly weaker and more intelligent (if you believe that)and we are losing some of our extremities... most notably our little toes.

2007-11-02 16:24:57 · answer #9 · answered by jesua 1 · 0 3

this might help clarify the answer.

2007-11-02 13:50:03 · answer #10 · answered by andy h. 4 · 1 3

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