<span>"The DNA in mitochondria is passed from mother to child in the nucleus of a cell."
I believe this is the correct answer. If it is not, try this one:
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"The Y chromosome doesn't experience crossing-over."</span>
Answer: Hemoglobin is crucial for oxygen transport in the blood because oxygen has a low solubility coefficient in water. :)
Fixator (--) helps hold a bone in place