Answer:
Stone
Explanation:
I would say stone because diversity fits the one above it and it makes more sense then stone does in the sentence.
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Guyana's education system comprises the following educational levels: nursery, primary, secondary, technical and vocational education, teacher training and university
The earth gets most of its energy from the radiogenic heat from the radioactive decay of isotopes
Assuming that this is referring to the same list of options that was posted before with this question, the correct response would be through a "mutual understanding," since this was the purpose of the Berlin Conference.