Lexis and structure: Choose the option that best completes the gap. The noise from the factory ___ the residents greatly.

Migration is movement of people between places. Internal: within country (rural-urban most common in Nigeria). International: between countries (emigration = leaving, immigration = arriving).

Push factors (origin): poverty, unemployment, conflict, environmental problems. Pull factors (destination): jobs, education, security, better services. People weigh factors in deciding to move.

Effects: on origin (brain drain, remittances, reduced population pressure), on destination (labor supply, cultural diversity, pressure on services). Migration policy balances economic needs with social concerns.