Ever heard of Evolution? Well, another word for it is Natural Selection.
My mom and dad recommended that I watch a video from Khan Academy everyday. There usually no more then 20 minutes long, and there easy to follow with visual assistance along with a guy talking you through the lesson.
Like "an apple a day keeps the doctor away", "You'll be a comer in every subject if you watch a video a day over the summer!" Not really... but it sorta rhymes right?
Well anyways, I watched the video above while munching on some food, and turns out you can learn something from these videos! In that particular video, it shows how evolution, or natural selection, works.
So, what kids or many people usually think when given the broad subject of evolution is that "Over a bunch of time, something in some animal or something changes to make life easier for it self. The end. " Well, that's not really correct. Say there is a Giraffe. Many people know it developed from a species similar to a horse, but do you really know how? Do you think that the horse couldn't reach the branch, so it urged it's DNA to make it's neck longer?
Well, you may not, but this is what really happened. The horse type creature, species, what ever! It had different variations. This means that there are different types of the same species. Take humans for example. You go to my school, you see short people (GO LIA! <3) you tallish people (Moi XD) and you see people in between. Not everyone is the same height, has the same hair color, eye color, and skin color.
So this means that the horse thing (maybe it was a unicorn? :P) had different length in necks. Some had a little longer necks then others. Not like a giraffe size necks on one, and a donkey size neck on the other, no, but maybe a difference in few inches. Then say as they were living life in a luscious field, the food source came down to a tree. The tree had many branches, and they all fed on the branches closest to the ground. Later on, those leaves all disappeared because the unicorns were feeding on them. So you can imagine what happens next?
The unicorns fly off into the sunset and create rainbows?
No.
The unicorns with the slightly longer necks can reach the slightly higher branches, and the other unicorns eventually die because they don't get the food. It wasn't like these unicorns were smarter, and said "I am going to have a long neck! And eat food the others can't reach!", they were just born that way. (YA I'M ON THE TRACK BABY I WAS BORN THIS WAY!) So ya. Their kids had their DNA so they grew taller too, and then eventually, there were MORE variations and some kids were taller then others. So the taller kids got the taller branches with more food, had kids, lived happy pot belly lives, and the cycle continued!
AND! now we have GIRAFFES! Ha!!!!! So I now told you the story of how a mythological creature turned into a zoo animal!
THE END!
Sab <3!
No comments:
Post a Comment