Respuesta :
Pollution is the unwanted harmful particles that occur from unnatural sources (factories, vehicles) and people. Thus, the statement is true. The correct options are 2. a, 3. d, and 4. c.
What is an ecosystem?
An ecosystem is a biological community that comprises organisms along with the physical environment. The disturbance in the natural environment may lead to unexpected results. Hence, option a is correct.
The microorganisms floating on the water surface are described by the word 'environment.' Hence, option d is correct. An inventory of the ecosystem must be taken when the species may be on the verge of extinction. Hence, option c is correct.
Learn more about the ecosystem here:
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