Juan’s professor probably describing about Charles darwin theory.
Juan's professor lectures on the fact that some characterstics in animals have been passed down from one generation to another, in this process of evolution. They proposed that evolution occurs because of natural selection.
They proposed that the fittest organism in the world are those who cope up with every type of environment means they are suitable in any climatic change and eventually survive by adopting themselves and are the ones who reproduce more and leave their more progeny as compare to unfit organisms. Fitted organism also have tendency to pass more characterstics to their offsprings. Those that are better physically equipped to survive, grow to maturity and are selected by the nature.
The phenomenon of genetic drift is another factor in the evolution of species. In cases of genetic drift, some species unexpectedly generate more offspring. Even if those organisms may not be the fittest of their species, the genes they contain are passed on to the coming generation.
To learn more about Natural selection, refer this link. https://brainly.com/question/23929271
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