STRUCTURAL ORGANISTION OF PLANTS AND ANIMALS
MORPHOLOGY OF ANIMALS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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populations change over time
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extinct species are not related to living species
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different species can interbreed and produce offspring that can reproduce
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animals that look alike are not closely related
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Detailed explanation-1: -Darwin proposed that species can change over time, that new species come from pre-existing species, and that all species share a common ancestor. In this model, each species has its own unique set of heritable (genetic) differences from the common ancestor, which have accumulated gradually over very long time periods.
Detailed explanation-2: -For example, evolutionary theory dramatically changed when Darwin’s original ideas were merged with ideas from genetics to become the Modern Synthesis. Evolution textbook author, Douglas Futuyma, presents a wonderful slideshow available on Youtube demonstrating the emergence of the Modern Synthesis.
Detailed explanation-3: -Over time, as generations of individuals with the trait continue to reproduce, the advantageous trait becomes increasingly common in a population, making the population different than an ancestral one. Sometimes the population becomes so different that it is considered a new species.
Detailed explanation-4: -Darwin postulates that growth is capped by the amount of readily available food and by the increased spread of parasites and disease among dense groups. Other facts include a corresponding rise in predator numbers, which all feeds into the Struggle. This same concept can be applied to humans.