"Survival of the fittest"
The world inhabited by living things is very harsh. They have to compete for everything such as light, food, shelter and mates.
All this and they have to avoid getting eaten!
Only the best suited will survive long enough to reproduce, and so pass on their genes to the next generation.
Organisms try to ensure that their offspring have advantages in survival. Many strategies are used to ensure this; some produce huge numbers of them so that at least a few will survive, others try to protect and shelter them for a long time - and care for them through school!
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