Q3. Answer the questions in one word. 1x3= (3) 1. Method of replenishing the soil with nutrients _______________. 2. Connecting link between non-living and living things ____________. 3. The vaccine for tuberculosis _____________.
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1.Composting
2.Viruses
3.bacillus Calmette-Guérin (BCG)
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- The nutrients are replenished in the soil by crop rotation. Changing the crops for every season will keep the land fertile. When one type of crop drains the nutrients in one season, then in the nest season plant different type of plant which will give back these nutrients to the soil.
- Viruses are the connecting link between the living and the non-living. This is because viruses are non-cellular organisms that are characterised by having an inert crystalline structure outside the living cell.
- The current TB vaccine, bacillus Calmette-Guérin (BCG), is a live vaccine that protects against severe childhood forms of disease, including milliary and extrapulmonary TB and the often fatal TB meningitis.
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