Question

name the phenomenon that governs the following green Bee
tles living in the green bushes are not eaten by the crows

Answer 1

survival of the fittest

Answer 2

Natural selection is the phenomenon that governs the green beetles living in the green bushes are not eaten by the crows.

According to Darwin theory, the natural selection, along with genetic drift, mutation and migration is a key of evolution. In the way we can find both brown and green beetles in the green bushes but the we can find more number of green beetles than brown one.  

Green Beetles are evolved to not to be spotted by any birds in a green environment where brown beetles can be easily spotted and eaten.