An alien species of plants invades their environment and the environment starts to change. Now, the frogs are no longer camouflaged in this environment. A bit of orange speckling on their green skin will, however, do the job of camouflaging wonderfully.
But there is not a single orange speckled frog so far in this island population.
Can someone explain to me how evolution will work to make the frogs survive?
First, as Taz said, they may not survive. This is called extinction. It has happened millions of times. Sucks to be them.
But, to address your rather contrived scenario. Just because there is no exemplar of the perfect adaptation to a new environmental feature doesn't mean no evolution will occur. Evolution does not require the best solution to a given problem. Evolution simply says that those better suited will likely leave more offspring than those less well suited. Thus, even if orange speckling would be the ideal camouflage, there may still be some other type of skin coloring that will be better than most. That type will become more predominant in succeeding generations.
Contrary to what you may have heard, evolution is not "survival of the fittest." It's more like "survival of those better suited to survive." Not as catchy, I grant you, but considerably more accurate.
BTW, welcome to EvC. If you truly are confused, there are many here who are more than willing to help clear up any confusion. May your stay here be entertaining as well as informative.
Ridicule is the only weapon which can be used against unintelligible propositions. Ideas must be distinct before reason can act upon them; and no man ever had a distinct idea of the trinity. It is the mere Abracadabra of the mountebanks calling themselves the priests of Jesus. -- Thomas Jefferson
For we know that our patchwork heritage is a strength, not a weakness. We are a nation of Christians and Muslims, Jews and Hindus -- and non-believers. -- Barack Obama
We see monsters where science shows us windmills. -- Phat
It has always struck me as odd that fundies devote so much time and effort into trying to find a
naturalistic explanation for their mythical flood, while looking for
magical explanations for things that actually happened. -- Dr. Adequate
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