Fill in the gaps using the words in the Word Bank below:
Ecosystems are a delicate balance between the _____________________ of living things and the ____________________ conditions of their habitat. The living things in the community interact through feeding relationships. These relationships can be displayed as ______________________. There are three main roles within food webs: ______________________ photosynthesise to convert energy into a usable form for other organisms; _____________________ eat organisms to gain their energy; and ______________________ break down dead matter to return the nutrients to the ecosystem. Microorganisms can feature at any level in a food web and are ____________________ to humans as part of our ______________________, by helping us to fight disease and to digest food. However, some ______________________ can also cause disease. Human activities can alter food webs; for example, the introduction of plant or animal species into an ecosystem or ______________________ and urbanisation, which results in ______________________. Ecological research has enabled humans to alter ecosystems for the better through the management of irregular ______________________ and improving ______________________ practices.
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\begin{array}{llll}
\text { abiotic } & \text { consumers } & \text { food webs } & \text { natural events } \\
\text { agricultural } & \text { decomposers } & \text { habitat loss } & \text { natural flora } \\
\text { beneficial } & \text { deforestation } & \text { microorganisms } & \text { producers } \\
\text { community } & & &
\end{array}
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