The diversity of beings in the world is amazing. The evolution as such is a tinkering process, trying out small changes at one time to find out if it can survive. Some thing that is lost in the translation is the evolution of higher organisms, is that each organism as a specie, is capable of survival, adaptation to the changing environment.
Higher organisms have better brain capacity, so that they can carry out additional functions. But they are not necessarily better in the game of survival. Every being from unicellular to human have the basic engines to eat, grow, propagate one way or other and communicate with their kind and also with the environment.
Trees are amazing as they have very few needs and withstand a lot of insult including cutting of limbs. Each organism is fittest in its own way. Otherwise there would be no amoeba or crocodiles any more. Some organisms have better sights than us, better hearing, better tactile response and motor action. Some insects can jump 10 times or more of their body length. Some organisms like fish and bees can change sex when needed and have eggs develop without fertilization which we can not.
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