Answer:
The Last Universal Common Ancestor (LUCA) is the most recent common ancestor of all current life on Earth, estimated to have lived some 3.5 to 3.8 billion years ago
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Explanation:
Xh is the recessive trait found in the female chromosome.
I believe a valley or mountain, but I am not 100 percent sure.
Answer: a compound known as calcium carbonate (CaCO3)
Explanation: Google the question itself