Examlex
The ________ of the immune system are designed to recognize foreign or harmful substances (antigens) , such as flu viruses, bacteria, and tumor cells, and then destroy or deactivate them.
Biodiversity
The variety of life in the world or in a particular habitat or ecosystem, including the diversity of species, genetic variation, and ecosystem variety.
Natural
Existing in or derived from nature; not made or caused by humankind.
Waste Disposal
The process of handling and discarding waste materials generated by human activities or natural processes.
Soil Erosion
The process by which soil is removed from a location, often by wind, water, or human activity, leading to loss of fertility.
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