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Explain two causes of ageing populations in MEDCs

One cause of ageing populations in certain MEDCs is improved access to healthcare. Improved access to healthcare allows individuals to receive treatment more promptly, assisting in stopping preventable illne...
JP
Answered by Jools P. • Geography tutor
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Analyse how barrier to entry determine the degree of competition in the British transport market.

A barrier to entry is any complication or expense a firm might encounter when entering the transport market. There are many barriers to entry such as economies of scale being exploited by pre-existing firms;...
NW
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What happens during eutrophication?

The addition of nutrients such as nitrate means that nutrients no longer limit plant growth.Algae begins to bloom which blocks out sunlight. As a result, plants cannot photosynthesise (or photosynthesis is r...
EC
Answered by Emily C. • Biology tutor
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Differentiate the function y = 26 + x - 4x³ -½x^(-4)

dy/dx = 1 - 12x² + 2x^(-5)
LM
Answered by Louix M. • Maths tutor
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How is immunity developed after a primary infection by bacteria?

Phagocytosis - A phagocyte detects the bacteria has foreign antigens and so envelops it with its cytoplasm, packaging it into a phagosome via endocytosis. Lysosomes then fuse with the phagosome releasing hyd...
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Answered by Daniel V. • Biology tutor
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