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Two forces drive the passive transport of ions across a membrane: -the concentration gradient of the ions -the effect of membrane potential (voltage) on the ions
Organisms evolve in tandem with one's adaptions driving the evolution of the other organism. For instance, rabbits are variations and some rabbits are born very fast indeed and leave these traits to progeny. Now foxes are also variations and the fastest fox is the fox that catches the rabbit that is representative of the rabbit population. So, fast rabbits drive the evolution of fast foxes and conversely, foxes drive rabbit evolution. Until the physical constraints are met. This is a simplified explanation as there are many fox and rabbit traits under selection pressure at the same time.
Mutation, genetic drift and gene flow can all drive evolution to a degree and the last two, drift and flow, are especially powerful in small populations. But, the driver of adaptive change in all populations of organisms is natural selection.
1:physical features in common 2:capable of inter breeding 3:producing fertile off springs
Evolution is the change in populations of organisms over time while speciation is the direct result of natural selection working to select individuals with traits different enough, but beneficial enough, y drive their alleles into greater frequency in popilations so that new species have a chance of arising; either by anagenesis or phylogenesis.
The fact that each star starts out with all the hydrogen that its ever going to have.
The 2014 Mitsubishi Lancer-Evolution has all wheel drive.
The 2004 Mitsubishi Lancer-Evolution has all wheel drive.
The 2006 Mitsubishi Lancer-Evolution has all wheel drive.
The 2011 Mitsubishi Lancer-Evolution has all wheel drive.
The 2003 Mitsubishi Lancer-Evolution has all wheel drive.
The 2008 Mitsubishi Lancer-Evolution has all wheel drive.
The 2005 Mitsubishi Lancer-Evolution has all wheel drive.
The 2012 Mitsubishi Lancer-Evolution has all wheel drive.
The 2013 Mitsubishi Lancer-Evolution has all wheel drive.
The 2010 Mitsubishi Lancer-Evolution has all wheel drive.
I assume you mean natural selection drives evolution.