It is called exothermic reaction because it releases heat and light and it is called combustion reaction because it is reacting and is being oxidised by O2 to MgO.
It can also be called as oxidation reaction since Mg is oxidised to MgO.
20 mol of NH, can be produce from 30 mol o H2
Answer:a leech
Explanation: a parasitic relationship is one organism benefit on the other while the other is harmed
