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Our Environment
Question
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Why is variation beneficial to the species but not necessarily for the individual?

Answer

Variations are useful for the survival of species in changed environmental situations over time. If a population of reproducing organisms were suited to a particular niche and if the niche is drastically changed the population could be wiped out. Species with variations have better chance of survival.For example- if there a population of bacteria living in temperate waters and if water temperature increases by global warming, most of bacteria would die. But few a variants resistant to heat would survive and grow further.
Variations are not neccessary for individuals because they are able to perform all the functions properly. 

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Some More Questions From Our Environment Chapter

How are variations important?

What is the importance of DNA copying in reproduction?

Why is variation beneficial to the species but not necessarily for the individual?

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