undergo differentmutations, andselection pressures and may evolve along different lines. Hisopinionof the part played by natural selection had little influence on othernaturalists. New organs are generated as per need.
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Thus, in smallpopulationsthere is a tendency for less variation because mates are more similargenetically. Splitting, thepredominant mode of species formation, results from the essay why people use drugs geographicalisolation ofpopulations of species. At the close of the Mesozoicthe once-successful marine ammonoids perished and the reptilian dynastycollapsed, givingway to birds and mammals. For example, as flowering plants have becomelessdependent on wind for pollination, a great variety of insects haveemerged asspecialists in transporting pollen. The Rise of MammalsThe decline of the reptiles provided evolutionary opportunitiesfor birds andmammals. Evolution is a continuous process and as we are discussing over it, we are also evolving. Although years after its constitution, a fortune of evidence from the fossil record and genetics supported the theory. Its been known for a fact that we, humans, evolved from apelike ancestors. Gene Flow New genes can be introduced into a population through newbreedingorganisms or gametes from another population, as in plant pollen. Eyes hearts, which are continuously used dont evolve, but develops defects. Example, humans to ape. Mutationsmost often occur spontaneously, but they may be induced by some externalstimulus, such as irradiation or certain chemicals.
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