Why do Populations Vary in Size? Carrying Capacity, abiotic and biotic factors

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This video covers AQA A level Biology 3.7.4 Populations in Ecosystems and looks at how populations of species can vary. DrBiology discusses population dynamics, carrying capacity and why populations vary due to abiotic (non-living) factors and biotic factors (living). He also goes through a few exam questions.
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Thank you so much! I was struggling with my science project but this literally saved my grade- thank you again!!!

TheNyanRainbow