It's more difficult because you have less control over the conditions, so many things can vary in the field, from site to site and from day to day. Also, you have all your personal practical arrangements to worry about: transport, lunch, where the toilets are and so on.
you have control in a laboratory
field study involves observations of living things.
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To verify whether or not laboratory conditions are necessary to recreate the results. If the same experiment produces the same results in different environments, then the scientist knows that the results are sound. However, if the results are different in different places, then it may be an environmental factor of the laboratory that is affecting the outcome. Repeating the experiment in different environments allows scientists to either confirm or rule out this possibility.
Maintaining the Scientific Method and a proper experiment with controlled variables. Probably more concern would be in a less controlled field environment.
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A hypothesis
you have control in a laboratory
A investigation
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