Human Populations (AQA A-Level Biology): Flashcards
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Current global human population size
Current global human population size
Exceeds 7 billion people worldwide
Primary factors determining population change
Primary factors determining population change
Birth rate and death rate
Immigration (definition)
Immigration (definition)
People joining a population from outside areas
Emigration (definition)
Emigration (definition)
People leaving a population to settle elsewhere
Population growth formula
Population growth formula
Population pyramids (definition)
Population pyramids (definition)
Graphs showing percentage of males & females in different age groups
Increasing population pyramid characteristic
Increasing population pyramid characteristic
Wide base due to high birth rates
Decreasing population pyramid characteristic
Decreasing population pyramid characteristic
Narrow base, lower birth rates, more elderly
Demographic transition Stage 1 rates
Demographic transition Stage 1 rates
High birth rate, high death rate, small stable population
Demographic transition Stage 4 rates
Demographic transition Stage 4 rates
Low birth rate, low death rate, large stable population