darwin and lamarck evolution theories
Post on 05-Apr-2017
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ANIMALSLAMARCKS AND DARWINS EVOLUTION THEORIES
SHORT NECKED GIRAFFE
LONG NECKED GIRAFFE
REACH (THE SKY)STRETCH
LAMARCKLamarck's Theory: Giraffes inherited long necks from short necked ancestors who continually stretched their necks to reach food.
Lamarck's Theory:In the very beginning, giraffes had got short neck and they used to eat leaves from short trees. Then, trees started to grow taller and taller and giraffes couldnt reach the leaves, so that, they had to stretch their necks to try to reach them and eat. That is, giraffes evolved from short to long necks throughout time (history).
Darwin's Theory: Long necked and short necked giraffes once existed together, but long-necked giraffes had an adaptive advantage.DARWIN
Darwin's Theory: Long necked giraffes and short necked giraffes existed together, but short necked giraffes disappeared because they were very hungry and they couldnt reach leaves from trees, so they died; and long necked giraffes survived. This is why we only see giraffes with long necks nowadays.DARWIN
DARWINS THEORY OF EVOLUTIONAnimals change over time in order to survive where they live. So, fish evolved to have gills because they needed to be able to breathe underwater. Some animals evolved to have sharp teeth or big claws so they could kill their dinner. Other animals evolved with scales or shells to protect themselves and not get eaten as dinner. Others evolved to fly or climb to get away from danger altogether. As people were evolving from chimpanzees, we didnt get any of those things.Instead, we got really, really smart brains. And we survived because we used those brains to think our way out of trouble. Plus, because we evolved to walk on 2 feet instead of 4, we wound up with hands that, combined with our smart brains, allowed us to do things like build houses, make clothing and weapons and eventually invent really important stuff.