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Importance of circumcision to Abraham and his decendants include;It was a sign that God had entered the covenant with Abraham and his decendants.A sign of purityActed as a reminder of the covenant madeIt distinguished those who belong to God as his chosen raceLed to attainment of God's blessingsIt made Abraham to be the father of faith to all nations.
Allows for energy production even cases of oxygen deficiency thus enables animals to survive.
Importance of humus to soil include;It supplies plants with food and mineralsIt produces high agricultural yieldsIt has high water retention capacity in the soilIt promotes the development of a structure that favours circulation of air and water.It contributes to further weathering of rocks through decompositionIt is a source for soil microorganisms.
Importance of ensuring steam is produced constantly when steaming food are;Ensure the pan containing boiling water is not damagedFood is not burnt
Selective re- absorption helps to return useful substances/ glucose and amino acids into the blood stream.