Answer: Trade, Investment, Tourism, International Organizations.
Step-by-step explanation:
Trade: Countries can exchange goods and services with each other, either through direct bilateral trade or through multilateral trade agreements.
Investment: Countries can also engage in foreign direct investment, where businesses from one country invest in and establish operations in another country. This can involve the transfer of technology, management expertise, and other resources.
Immigration: People can move from one country to another, either for work, education, or other reasons. This can involve the transfer of skills, knowledge, and cultural practices.
Tourism: People from one country can visit another country as tourists, allowing for the exchange of ideas and cultural experiences.
International organizations: Countries can also share ideas and cooperate on issues of mutual concern through international organizations such as the United Nations, the World Trade Organization, and regional organizations like the European Union.