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- All ——- organisms require energy for metabolic activities and sustenance.
- Biomes are ———– and geographically defined areas of ecologically similar characteristic appearance of communities of plants, animals and soil organisms
- The explosively growing ————– is placing considerable stress on the environment to the extent of being harmful to Organisms.
- External parasites live on the bodies of ———- mainly birds and mammals. They include lice and fleas.
