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Rolling is necessary because;It improves the contact between the seed and the soilIt compacts the soil hence reduces soil erosionPrevents small seeds from being carried away by wind eg grasses
Law is necessary in a society so as;To safeguard the rights/freedom of the peopleTo ensure security/protection of the people and propertyTo promote peace/harmonyTo promote peaceful relationships among communityTo control power of those in authorityTo enable government to implement its policies effectivelyTo promote economic development
Reason an ethical practice is necessary in product promotion is;To safeguard consumers against misleading advertisement.To curb environmentally degradationTo ensure compliance with existing government legislation.To curb environmental; degradation since some promotional activities may have adverse effects on the environment.To safeguard cultural practices sometimes product promotion encourages use of foreign products and styles that conflict with the culture of various communities in the country.To safeguard competitors in the market by controlling unhealthy competition.To encourage selling of quality goods including stating correct ingredients.
It is necessary to manage and conserve our environment so as;To sustain human life - depend on environment for food, water, shelter, air and clothing.To preserve genetic resources/protection of endangered species to ensure their sustainable utilization.For future generation - the resources will be able to regenerate and serve future populationsFor economic value - a lot of natural resources in the environment are of economic importance e.g minerals, soils and forest.For aesthetic value - components of physical environment eg lakes, mountains wildlife are beautiful. They should be managed and conserved so that they attract tourists hence a source of revenue to the government.
Reasons why Africa is referred as the cradle of mankind are;Several archeological sites have been found in AfricaPresence of savannah grassland where man could hunt and gather foodWarm tropical climate, ideal for early man's existenceAfrica is centrally located geographically, making it possible for early man to migrate to other regions as the continents were driftingSeveral tools and weapons remains have been discovered in the continent.