The best and most correct answer among the choices provided by your question is the third choice or letter C.
Human activity is the primary cause of the rapid rise in loss of biodiversity.
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Tooth length is influenced by natural selection
when you have healthy teeth If you lose one
tooth chances are your other tooth will be
crooked until that tooth grows back in, Your
teeth all help each other keep each other strait.
But if you are not taking care of your teeth than
your teeth will not be strong enough to grow
longer or any bigger.