Radium was discovered by Maria Sklodowska-Curie -the correct answer is b. Actually she discovered it together with her Husband, Pierre Curie, they obtained it from a uranite sample.
Answer:
the activity of mixing socially with others.
Explanation:
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The mother country did this to protect its trade from suffering loss. Achenwall's Observations on North America Gottfried Achenwall.
Establish and enforce laws