Effects of Human Activity on Ecosystem Quiz App Download - IGCSE O Level Biology e-Book
IGCSE O Level Biology MCQs - Chapter 7
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Problem of solid waste disposal can be reduced through
Non-toxic, unreactive chemicals used as cooling agents in refrigerators are known as
Lives of organisms in ecosystem become threatened due to
If a substance accumulates in a body for a long time, it will be
Most fertile layer of soil is
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