The biggest challenge is rejection. Sometimes the human body will not accept the pig organ unfortunately.
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Answer:
Chromosome crossing over in prophase 1 where DNA segments are moved between the homologous pair.
Explanation:
The answer is B) Amoeba
hope this helps
Answer:
I agree it would be A) IT is a reactant in a chemical reaction
Explanation:
a catalyst is a substance that causes a chemical reaction to happen in a different way than it would happen without that catalyst
I would say A but i would get a second opinion
