3 The blackberry Rubus fruticosus is a plant that grows in deciduous woodlands in many parts of the world A 30 m transect was

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3 The blackberry Rubus fruticosus is a plant that grows in deciduous woodlands in many parts of the world A 30 m transect was laid out in a woodland to investigate the relationship between light intensity and blackberry growth The percentage cover of blackberries and the light intensity were measured at 26 positions along this transect Blackberry growth cover 100 90 80 70 60 50 40 30 20 10 0 0 H 200 TOT D 400 600 800 1000 1200 1400 1600 Light intensity lx a Outline how these results indicate that blackberry distribution is limited by light intensity 2 b Distinguish between the transfer of matter and energy in closed ecosystems 1 c A pyramid of energy represents the amount of energy taken in by each trophic level per unit ime and per unit area Discuss the advantages and disadvantages of the use of pyramids of

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