A particular thank you to Sapphireswimming who's drabble 'registration' was instrumental as well as all kind beta advice.
I suppose this isn't actually a true drabble since it has 250 words – maybe I should call it a dribble?
As you can see, the science teacher in me has come out for this one.
Disclaimer: I do not own Danny Phantom.
Credit for the Theory of Evolution, Natural Selection, Differentiation of Species, Survival of the Fittests is Charles Darwin.
Differentiation of the Species
If he hadn't missed so many biology classes in high school, he would have found out earlier. As it was it came as a bit of a shock.
The TA was lecturing about basic biology. After a few mandatory innuendoes about passing genes onto the next generation, he began outlining the Theory of Evolution. Danny dutifully took notes on Darwin, Natural Selection and Survival of the Fittest.
"So eventually these differences were enough that the finches were considered separate species. Where there was one species, there now are two."
A student in the front raised her hand. "So, how do we know when the differences are enough that they are considered separate species?"
"Good question. There is some debate over the exact definition but in general when they no longer mate and produce fertile offspring. So that dogs, of which there are many breeds, are considered a single species because they can mate and produce puppies. These mutts can produce offspring of their own, in turn.
Differentiation can also occur if there are changes in courtship behavior, geography, or other factors that prevent mating.
There are also cases such as the mule, which is produced by breeding a male donkey with a female horse. The mule is a hybrid of both parents but is sterile so they cannot 'breed true'. Since mules are sterile, donkeys and horses are considered different species. Basically when you mess with the DNA enough they are no longer compatible."
The color drained from Danny's face.