1. Evolution and Natural Selection
... have no noticeable effect on the organism. Mutations can be helpful, neutral, and even harmful. This depends on the environmental conditions. Mutation provides the start for other forces, like natural selection. Natural selection can spread the mutation or eliminate it. Not all mutations start evolution. Some mutations occur on non-reproductive cells and won't be passed onto the offspring. Some mutations can ... fighting other males. For example, the male peacock displays its bright feathers to attract females. The females are selecting the best genes to pass on. Therefore, non random ma...
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