At 5/20/09 02:10 PM, Jackho wrote:
but there is one thing i dont get
if they say we evolved from ape yet there are still plenty of apes around today then why is there no longer any living 'missing links'?
This one needs a bit of an explanation:
Let's call the missing link species A. Over time, species A's environment will change, leading to either the evolution of a new species, or the migration of the species into a different environment. In this case, let's say both happens, and species A gives rise to species B in its original environment, and species C in the environment it migrates to as a response to the change.
New species are generally better than their predecessors at surviving in the environment they evolved to live in, which usually (but not always) leads to the out-competing of the ancestral species by the new ones. In this case, species A would be out-competed by species B in its old environment, and by species C in the environment it migrated to.
In such scenarios, species A has no environment which it won't be pushed out of, and therefore it will go extinct due to being out-competed by its evolutionary offspring in all the environments it is found in.
This can explain why there appear to be holes in the living record of history. If the predecessor species could no longer deal with the competition, they would've died off.