Outline how habitat corridors can aid conservation of biodiversity in a nature reserve.

Explain how living organisms can change the abiotic environment during primary succession.

a. they allow species to travel between habitats / OWTTE;

b. outline of an example of a habitat corridor;

a. lichens secrete chemicals/acid which break down inorganic material/rock;

b. lichens/plants/litter change pH of the soil (which prevents/assists some species to establish);

c. organisms increase the mineral/organic/humus content of the soil when they decompose;

d. (organic matter and humus) can increase water retention;

e. plant roots can bind soil preventing erosion / break down soil particles;

There were mixed answers about habitat corridors. Many candidates apparently answered a previously asked question describing primary succession instead of focusing on the changes in the abiotic environment and the role of decomposition, resulting in generally poor answers.

Many candidates apparently answered a previously asked question describing primary succession instead of focusing on the changes in the abiotic environment and the role of decomposition, resulting in generally poor answers.