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If a geneticist is studying how DNA replicates,is expressed and how mutations occur in the DNA strand,perhaps by studying a particular DNA sequence,he is practicing:
Export
Goods or services produced in one country and sold to buyers in another country.
Trade Barriers
Measures implemented by governments to restrict international trade and protect domestic industries from foreign competition.
National Security
Measures taken by a state to ensure its survival, economic stability, and protection from threats.
Tariff Revenue
The income earned by a government from levying taxes on imported goods.
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