How does the geographic insolation affect speciation? provide an example

Hola!

Geographic Isolation prevents the cross breeding between the populations that have been separated by the isolation.

Without the separation the two growing population would be brought closer together and members of the two populations will cross breed.

♦ Example:
There are two populations of squirrels on either side of the grand canyon.
↑↑↑
These populations are considered two different species. 

We can conclude that these 2 populations were once one population.
Isolation allowed the two populations to move apart and speciation occurred.

hope it helps!

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.