Oxygen keeps a plant s roots healthy and allows the plant to take up nutrient. Oxygen is the key to growth rate. Without oxygen around the roots, the roots will rot and die. You cannot grow in water, unless you dissolve oxygen in it.
The term federalism is also used to describe a system of government in which sovereignty is constitutionally divided between a central governing authority and constituent political units (such as states or provinces).ederalism is a system based upon democratic rules and institutions in which the power to govern is shared between national and provincial/state governments, creating what is often called a federation.
A number of key theoretical differences exist between a presidential and a parliamentary system: 1  In a presidential system, the central principle is that the legislative and executive branches of government are separate.n a full-fledged presidential system, a president is chosen directly by the people or indirectly by the winning party to be the head of the executive branch. Presidential governments make no distinction between the positions of head of state and head of government, both of which are held by the president.