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Significance of oceans include;Presence of oceans modifies climatic conditions of an area through land and sea breeze.Ocean provides rich grounds for subsistence and commercial fishingOcean tides and waves can be harnessed to produce tidal powerOceans are natural habit for marine lifeProvides cheap free water ways for transport of goods and services across continentsProvides site for a variety of recreational activities e.g water skiing, cruising sportOcean provides grounds for navy/military activities
Significance of nursery in crop production include;Production of many seedling in a smell spaceRoutine management practices are easily and timely carried outEnsures transplanting of only healthy and vigorously growing seedling.Facilitates the planting of small seed.Reduces the period of the seedling take in the seed bed.
Function of centromere during cell division is to;Hold sister chromatids together
Function of centrioles during cell division is;Formation of spindle fibre
Centromere holds chromatids together and provides point of attachment to spindle fibres.