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1.5 analyse information from secondary sources to prepare a case study to show how an environmental change can lead to changes in a species

analyse information from secondary sources to prepare a case study to show how an environmental change can lead to changes in a species

Starting information: Possible case studies of changes in a species

Changes in physical conditions in the environment

The teeth of kangaroos have been selected in response to changes in physical conditions in Australia over the last 25 million years.

Changes in chemical conditions

Chemicals, such as dieldrin and organophosphates, have been used extensively to control the sheep blowfly, Lucilia cuprina. Genetic resistance has occurred within the fly population in response to these chemicals.

Competition for resources

Some species of fruit fly have evolved into different species with each confined to a different type of fruit tree.