Theory of evolution

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an info sheet with information about natural selection

Charles Darwin and Alfred Russel Wallace's theory explains how evolution occurs. Individuals naturally vary in traits in a population. With limited resources, competition exists in which those better adapted - with beneficial traits suited to the environment - are more likely to obtain resources, survive, reproduce, and pass traits to offspring over successive generations. This natural selection of advantageous traits leads species to evolve over time.

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a man in a suit is walking with monkeys and another man holding a stick behind him

Table of Contents (click to expand)What Is Evolution?What Is Orthogenesis?How Much Does Orthogenetic Theory Get Wrong?A Final WordThe short answer is no. Not all evolutionary change needs to be a response to external selection pressures. They can also just be random or neutral in nature. Very often, evolution is branched, so there is no one straight line.When we think of evolution, many of us think of this famous picture:However, this picture, which depicts the evolution of man, may actually…

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the theory of evolution by natural selection is shown in this graphic above it's description

The Theory of Evolution by Natural Selection. Theory of Natural Selection. 5 Key Observations. Inferences. In each generation, populations produce more offspring than there are adults. Populations do not continue to grow in size. Individuals within a population compete for resources. Slideshow...

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a tree with different types of plants and animals on it, labeled in the diagram below

A phylogenetic tree is a graphic that shows how creatures have evolved over time. Phylogenetic trees are only that: theories, not facts. A phylogenetic tree's branching pattern indicates how species or other groupings emerged from a common ancestor. Two species are more linked in trees if they have a recent common ancestor, and less related if they share a distant common ancestor. Phylogenetic trees can be drawn in a variety of ways. The information carried by a tree does not change as it is…

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