First there is the general meaning which no one argues about: just change over time. In this sense, you evolve as you learn and experience life; your job evolves as you add or subtract responsibilities. Change occurs in almost everything as time goes on.
Then there is micro-evolution, which no one argues about: all life species change somewhat in relatively minor ways. The size of a bird species' beak can change with changing circumstances, for instance, so that most of the birds in an environment have stronger/bigger beaks when the seeds available to eat become tougher. An apple is developed by horticulturists that is sweeter and juicier than others.
photo: mrjacksfarm.com
But it's the third type that does get argued about: macro-evolution. This theory says that changes in a kind of animal/plant happen over generations to the point that the later animal/plant is actually a different kind than its ancestors were, and all the kinds of life on earth came about this way.
There are lots of implications to this meaning of evolution.
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