1. Describe an example of a population cycle

The most well known example of creatures which have a population cycle is the lemming. The biologist Charles Elton first identified in 1924 that the lemming had regular cycles of population growth and decline.

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Cities were dirty, noisy, and overcrowded. London had about 600,000 people around 1700 and almost a million residents in 1800. The rich, only a tiny minority of the population, lived luxuriously in lavish, elegant mansions and country houses, which they furnished with comfortable, upholstered furniture

By the end of the 1800s, all of this was starting to change. Many more people lived in cities and worked in factories or in offices. Many people had gas lights or electric lights. People took trains to get places.

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