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I'm assuming you meant and frailness not fertility, in which case it is the oldest old period
Answer:
If the parent reproduces sexually, it's offspring will inherit exactly half of it's DNA. The other half is inherited from the other parent. If the parent reproduces asexually, it's offspring will be a clone (i.e. have the same DNA).
Explanation:
A. Kidneys are the organs in the urinary system that produce urine after breaking it down from food.