• It is not usually possible to sample an entire population or community, therefore, sub-samples are commonly used to collect vegetation data in the field.

• Data should be considered in terms of its accuracy, precision and bias.

• Life tables and survivorship curves are used to interpret survival and mortality data within populations.

• Experiments can be done in controlled conditions in the greenhouse or growth chamber, or in natural conditions in the field. There are advantages and disadvantages to each of these.

• Experiments should be designed so that they answer the specific question that you are asking.

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