Extinction
Extinction is officially defined as the disappearance of a species from the earth. Something pretty awesome about us humans is that we are intelligent enough to know about species that once existed. This is because some people have superpowers so they can look into the past!

Haha... no that's a down right joke! Really, what we can do is use fossils which indicate the previous presence of a type of animal. Minerals replace the contents of the animal and preserves the shape and size of these old species even if the bones, teeth or shells can't remain as proof for us.

Okay, so that's cool. We can learn about old species. But why does extinction even happen in the first place?
This may be due to a number of factors: Let's see...

1. There may be a disease which wipes out the entire population.
2. Their may be a dramatic change in the climate or a natural disaster like a volcanic eruption which wipes out the population.
3. There may be a new predator and due to natural selection, it may cause the old species to find it difficult to survive in such competition
4. There may be a lack of prey or food.
5. Some evil humans may destroy their habitats! :(
6. A really weird one is the factor of speciation- and this means that the old species becomes extinct because a new species develops from it.

Here, I'll explain it to you...

	Creado por esekanayo hace más de 9 años

Apunte sobre Science Additional- Speciation and Extinction, creado por esekanayo el 05/03/2015.