It's hardness
Example 10 is diamond
and 1 is Talc
They produce pockets (eggs) for fertilization and they produce the reproductive hormones, oestrogen and progesterone.
If the parents have black hair then all the kids would have black hair (a)
if one parent has blonde hair and the other has black hair then 2 kids would be blonde and 2 would have black hair (d)
if the parents have blonde hair then the kids would have blonde hair (c)
Answer:
Mitochondrial DNA is useful as a molecular clock because it displays uniparental inheritance
