Tag Archives: Mutations

195. The Science of Evolution and Life

19 Dec

In some recent discussions, I was disappointed by how biological evolution is poorly understood by many people. Here are some facts about evolution and life, which may be helpful.

The unbiased scientific view is: that life is just a complex variation of matter and will begin when certain organic (based on carbon) compounds happen to combine in a particular way, without any purpose or design (see below for details). An exploding star or the “birth” of a star, just happens,  without any purpose or striving. There are many amazing processes in astronomy and on Earth that just happen. Does the moon circle the Earth due to some striving? When an earthquake occurs,  is there a purpose or goal?

The origin of life and its gradual evolution, in the same way, just happens. Some philosophers and other non-scientists see purposes, goals, striving, drives, etc. in many areas. Scientists ignore all this and are concerned with physical laws and objective descriptions of events. Nothing that happens on Earth or in space seems designed, particularly because of general disorganization and imperfections.

The origins of life and evolution, progress by the principle of “survival of the fittest.” Life and death provide variation and some variations are relatively permanent (mutations). If a variation leads to a better chance of survival, at least long enough for reproduction, then on a statistical basis, it is more likely to occur. Evolution depends on the fact that variations may be persistent and occur in subsequent generations. For example, a species of bird may  have small variations in the length of its beak. It may be that birds with a slightly longer beak are able capture food better. Under the concept of evolution, birds with longer beaks likely will survive better and eventually, this species will have longer beaks. There is no design or purpose here, it just happens as a property of matter.

At this point, you might ask, how can the amazing and complex features of life, occur without the design of someone or thing? In order to understand this, consider that these developments happen in a slow process over billions of years. It is difficult for people to mentally cope with things out of the ordinary time spans and sizes that we are used to. Can you comprehend the size of our solar system, or worse, the galaxy or the entire Universe.  In the same way, five billion years is beyond our comprehension. It should not  be surprising that amazing things can happen in that incomprehensible long time.

You might further inquire, how can there be a transition from ordinary matter to the very first life? The answer is this. The Universe is mostly filled with very simple atoms, mostly hydrogen and some helium. The more complex atoms and molecules develop mostly through supernovae, which are gigantic star explosions (see for example: Wikipedia: “Abundance of the chemical elements.” Right from the very beginnings of the Universe, there was ubiquitous movement. Almost everything is in constant motion, at the very smallest levels (atoms) and the very largest (stars and galaxies). The movements of certain atoms, especially carbon, oxygen, hydrogen, etc, resulted in the formation of organic (carbon based) compounds. Movement and accidental contacts of organic compounds resulted in something extremely unlikely, a compound that had the property of “life.” It only took one extremely unlikely combination of compounds out of trillions and trillions of chance interactions, to produce in one instance, a compound that could reproduce itself (living). Because of reproduction, this one case could spread life all over our planet. It may be difficult to understand all this, without reference to chemistry and biology textbooks.

Now we come to people. We all want to feel that we are “special,” but like all life, and all actions we see in the Universe, we just happen. Every plant or animal is constructed and develops as a consequence of the DNA it inherits, and all of the experiences it is exposed to. Experiences include learning, parenting, imitation, food sources, environmental and social factors.

This may be disappointing and confusing for many people, but scientists see no evidence for anything else. Given this bleak picture, my advice is to live your life in a normal, responsible, and enjoyable way, but when appropriate for some intellectual reason, recognize reality. Personally, I like to live my life with kindness because it is good for me, and for others — a win, win. (I welcome criticisms and comments.)