OBJECTIVE LIFE SCIENCE
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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from a common ancestor
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by mutation
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by genetic drift
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from extra terrestrial spores
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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: -In the Origin of Species, Charles Darwin famously proposed what we may now call the Universal Common Ancestry (UCA) hypothesis: “I should infer from analogy that probably all the organic beings which have ever lived on this earth have descended from some one primordial form, into which life was first breathed.” [1].
Detailed explanation-3: -The theory of evolution states that all life has a common ancestry. The direct proof of evolution would be knowledge of lines of descent, that is, actual specimens showing gradual transition from form to form. Fossils provide such evidence.