Thanks in advance. I come from a Christian school so they don’t teach evolution because they don’t believe it.
In: Biology
Let’s imagine there is a species of light green insects who live on an island where the plants have light green leaves.
One day a bird picks up a branch covered in these insects’ eggs to use in their nest. They carry it a long way but accidentally drop it on a different islands where plants have dark green leaves.
These insects survive, but being a different color to the leaves means they often get eaten by birds.
They’re not all the same color though, random mutation means since are slightly different shades of green. The lighter the green, the more likely that individual insect will be eaten first.
So on average more of the darker insects will survive to lay eggs than the lighter ones. And they pass that color down to their next generation.
Mutations will keep changing the color as well, starting with that darker color and then either making it lighter again or making it even darker.
The darker the insect, the better they blend in with the leaves they are living on and the less likely they are too be eaten.
Over millions of years all these small changes followed by the external pressure of the “less fit” individuals getting eaten means the insects can become perfectly camouflaged just though these small random changes.
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