The diagram shows the breathing system in humans. Which labelled part is surrounded by blood capillaries for gas exchange?

21.1.1 State how modern technology has resulted in increased food production in terms of: – agricultural machinery to use larger areas of land and improve efficiency – chemical fertilisers to improve yields – insecticides to improve quality and yield – herbicides to reduce competition with weeds – selective breeding to improve production by crop plants and livestock, e.g. cattle, fish and poultry

21.1.2 Describe the negative impacts to an ecosystem of large-scale monocultures of crop plants

21.1.3 Describe the negative impacts to an ecosystem of intensive livestock production

21.1.4 Discuss the advantages and disadvantages of genetically modifying crops, such as soya, maize and rice

21.1.5 Discuss the social, environmental and economic implications of providing sufficient food for an increasing human global population

21.1.6 Discuss the problems which contribute to famine including unequal distribution of food, drought and flooding, increasing population and poverty