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There is variation in the population. Some of the elephants have tusks, while others were not born with them
Mom, why does he look like that? Where are his tusks?
Traits are heritable. The tusks on one of the elephants resembles the moms, the the tusk-less elephant represents the dad
He has your big ears!
Awe, he has your tusks
There is a "struggle for existence" because too much offspring was produced. The tusk-less elephants are struggling to survive
Oh no! He didn't make it
No tusks are really effecting me in this environment.
Elephants with tusks are more likely to survive and reproduce than tusk-less elephants because reproduction and survival are not random.
I have tusks, that can help me thrive in this environment!