tell me what natural selection is...and i will help
The process in nature by which, according to Darwin's theory of evolution, only the organisms best adapted to their environment tend to survive and transmit their genetic characteristics in increasing numbers to succeeding generations while those less adapted tend to be eliminated.
...jeez you people and copy paisting...anyway...take humans for example...we come from other organisms that have adapted over time (or so they say) what would have happened if the fish had not grown legs during the iceage?
We ... would not have legs?
we ...would not have existed and all the fish could have died out leaving nothing but micro organisms...elaborate on that and you have the answer
We wouldn't have existed.
Can I step in here? I can try to help you. ~~~~~~~~~~ First off, I understand that definitions from online science websites can be confusing. I mean, take a look at the definition for "Natural Selection" that you copied and pasted. Can you read and understand that, 100%? Because I sure can't. ~~~~~~~~~~~ Let me give you a simple explanation of "Natural Selection." NATURAL SELECTION is where nature decides who lives, and who dies. It's that simple. ~~~~~~~~~~~ For example, pretend that it is VERY cold outside. FREEZING cold. And pretend that there are animals outside. Some animals DO have fur to keep them warm, and some animals DON'T have any fur, to keep them warm. QUESTION: What will happen to all the animals that DON'T have any fur? ANSWER: They will freeze to death. They will die. You get it? ~~~~~~~~~~~~ Again, NATURAL SELECTION is where nature decides who lives, and who dies. In my example, nature was very cold. And so, nature decided that all the animals that COULD NOT handle the cold would DIE. And all the animals that COULD take the cold would LIVE.
Survival of the fittest.
That's right. We can think of it as "survival of the fittest." That's what it is.
You know what "survival of the fittest" means, right? Basically, only the organisms that can handle the environment will live. Survive. The others will die.
I know what 'survival of the fittest is'.
Wonderful. Okay. So I gave you an example of Natural Selection. The example where the cold weather decided who would live, and who would die. That's an example of Natural Selection. So, what would have happened, if natural selection never happened? Would any animals have died?
Let me think. No?
Because it nature hadn't chosen who would live/died, then everyone would've lived, I think.
That's right. Everyone would have lived. None of the animals would have died. ~~~~~~~~~~ Now, let me tell you a fact, that you probably already know: When animals make babies, the children tend to look like their parents. So, if two FURRY animals make babies, all of their babies will be probably be FURRY. Just like their parents. If two NON-FURRY animals make babies, then none of the babies will have fur. Just like their parents. ~~~~~~~~ Does that make sense so far?
Yes. You should become a teacher :)
I plan on it. But I'm glad you're following along. That's what matters. ~~~~~~~~~ Okay. So...here's what I think. Ready? If Natural Selection DID happen, then all of the NON-FURRY animals would have died. And so.... there would ONLY be FURRY animals left. And so... all of those furry animals would make furry babies! ~~~~~~~~~~~~ BUT.... if Natural Selection DIDN'T happen, then NOBODY would have died. There would still be some furry animals, and some non-furry animals. And so, some of the children, of those animals, would have fur, and some of them would not have fur. ~~~~~~~~~~~~~ Does that make sense?
Okay, so we see here that if Natural Selection had never happened, then a few things could have happened. The species population might have been BIGGER, because there would be more animals. The children, of the population, would have had different PHENOTYPES. Different looks, and appearances. Because some would be furry, and some would not be furry.
Okay,yes, I get what you're saying.
Awesome. My example of Natural Selection was very different from SnuggieLad's example, you see. Because different examples can all have different meanings. But remember, Natural Selection is always the same: Nature decides who lives, and who dies.
Okay, thanks! How should I state it?
My answer, I mean.
Well, you need 3 things: ~~~~~~~~~~ 1. A definition of "Natural Selection." You can use my definition, or your own "survival of the fittest." ~~~~~~~~~~ 2. An example of Natural Selection. You can use my example, SnuggieLad's example, or come up with your own example. ~~~~~~~~~~ 3. An explanation of the example. You can explain how the example works, like how I explained my example, about cold weather and furry animals. ~~~~~~~~~~~ As long as you have those three things, you can put it all in your own words, and you'll be fine. If you want, you can do it, and then show me, here in this post. I can go over it for you.
Okay. Let me see how I would word my answer, then I'll type it here, and you can see if it's a good response to the question.
Yes. Take your time. I do have to log off openstudy now, but I will come back later and check this post.
Well, okay :( I hope to se you again soon!
I'll be back to check this post again, so you probably will.
Thank you very much for your long and thorough replies!
@InYourHead I must use a specific species.
Can you think of any that turned furry over time ?
We need to use a specific example that ACTUALLY happened? My example was hypothetical. It just meant to show how natural selection works. So I really don't know any real-life examples that would match my example, I'm sorry.
Oh. Well. That's okay.
I couldn't find any on google, unfortunately.
Op can you think of ant real-life examples of natural selection?
I'm sure we could come up with specific examples. SnuggieLad's example might have actually happened, in real life. The whole thing about how fish evolved legs. I just don't know anything about that example. So I wouldn't be able to help you there. ~~~~~~~~~~~ How about....skin pigmentation? I can explain this for you. And then you can put together your assignment, in your own words. You know humans all have different skin colors, yes? Some are light skinned, and some are dark skinned. There's a reason for why people have different skin tones. It's because dark skin protects us from harmful ultraviolet (UV) radiation. Think about where many dark-skinned people live. Places like Africa, and the Caribbean. Those places are very hot. They get a LOT of sunlight, which means they get a lot of UV radiation. You follow so far?
Let me read all that-- one moment.
Yes, I follow so far.
Okay, so...what must have happened, a LONG time ago, was Natural Selection. A long, long time ago, in Africa, there may have been many kinds of people, with many kinds of skin tones. Some people might have had light skin, and some people had dark skin. Again, dark skin protects us from the sun's harmful UV rays. So, the sun's harmful UV rays must have killed all of the light-skinned people. And then, there were only dark skinned people left. And when all of those dark skinned people had children, all of THEIR children had dark skin. That's why most of the people in Africa, today, have dark skin. Does that make sense? Any questions?
Okay. So we have an actual example. And of course, the species that we're talking about is "Homo sapiens." Humans.
ok. how can i state my new answer?
You can put it however you want, in your own words, as long as you have these three things: 1. Definition of Natural Selection 2. Example of Natural Selection 3. Explanation of the example State it any way you want, in your own words. After you're done, you can post it here, and I can go over it with you.
Natural selection, or survival of the fittest, is the theory that nature 'chooses' or selects what organisms will survive under certain circumstances .
Is that good so far?
Yes, that's good. You've got the first one done.
An example of natural selection would be skin pigmentation.
good so far?
Yeah. You can use that example.
The sun's harmful rays may have killed light-skinned people a long time ago, leaving only dark-skinned people alive.
Why did all the dark skinned people live?
I for got to add that in.
A long time ago, there were dark and light - skinned people in Africa. Unfortunately, the Sun's harmful rays may have killed off all light-skinned Africans.
That is why today there are more dark-skinned people in Africa.
So good so far. But why did the dark skinned people live?
Right right i keep forgetting sorry/
It's okay. Can you tell me why they lived?
A long time ago, there were dark and light - skinned people in Africa. Unfortunately, the Sun's harmful rays may have killed off all light-skinned Africans. The dark-skinned Africans lived because their skin pigment protected them from the Sun's rays.That is why today there are more dark-skinned people in Africa.
Is that good? ^
Yes, pretty good. Their dark skin protected them from harmful UV radiation. Remember to mention UV radiation, kay?
Okay. 'A long time ago, there were dark and light - skinned people in Africa. Unfortunately, the Sun's harmful rays may have killed off all light-skinned Africans. The dark-skinned Africans lived because their skin pigment protected them from the harmful UV radiation.That is why today there are more dark-skinned people in Africa.'
Yeah, that's good. Wonderful. ~~~~~~~~~~~ Okay, so I just remembered that there IS a 4th point, that we have to include: "What would have happened to the species if natural selection hadn't happened?" We gotta answer that question. Do you have any ideas, based on all this info?
All Africans, light skinned or otherwise, would've been killed off by the UV rays?
I actually like to think that none of the africans would have been killed.
Well, natural selection decides who lives and who dies. That was the UV radiation, from the sun. The UV radiation was nature's way of deciding who lives, and who dies. If it weren't for natural selection, then I don't think that the UV would have killed anyone.
You're welcome. There's more to that, though.
See....if natural selection never happened, then there would have been both light-skinned AND dark skinned people, in Africa. And when they made children, their children would have had....tan skin. Like a combination of dark AND light skin, you know?
Yes! I get it now! :0 Thank you very much. Very much indeed.
So....if natural selection had never happened, then today, Africa would probably not have so many dark skinned people.
That is a good hypothesis.
It makes sense to me. Anyway, you're welcome.