"Evolution always leads to more complex organisms."
Here's why:
* Evolution is not a ladder: Evolution does not follow a linear path towards complexity. It is a branching process. Simple organisms can persist, and complex organisms can simplify.
* Natural selection favors fitness: The driving force of evolution is natural selection. This process favors traits that increase an organism's chances of survival and reproduction in a particular environment. Complexity is not always advantageous.
* Examples of simplification: Some organisms have simplified over time, such as parasites that lose complex features because they rely on their host for survival.
Key points about modern evolutionary theory:
* Evolution is a fact: We see evidence of evolution in the fossil record, genetic similarities between species, and ongoing adaptations in organisms.
* Natural selection is the primary mechanism: Natural selection acts on variations within a population, favoring traits that enhance survival and reproduction.
* Evolution is a gradual process: Evolutionary change happens over many generations, with small changes accumulating over time.
* Evolution is ongoing: Evolution is not a finished process. Species continue to adapt and change in response to their environment.
