The most important factor in survival is neither intelligence nor strength but adaptability.

The world will not be inherited by the strongest, it will be inherited by those most able to change.

It is not the biggest, the brightest or the best that will survive, but those who adapt the quickest.

Species that struggle to adapt to survive will become extinct.

How have all those exquisite adaptations of one part of the organisation to another part, and to the conditions of life, and of one organic being to another being, been perfected?

Hence it is quite credible that the presence of a feline animal in large numbers in a district might determine, through the intervention first of mice and then of bees, the frequency of certain flowers in that district!