(i) What is a biogas? (ii) What is biogas technology?
(iii) State two differences between a biogas and a bio-fuel?
(iv) List two raw materials each for producing biogas and hin-fuel

(i) Biogas is the mixture of gases produced by the breakdown of organic matter in the absence of oxygen, primarily consisting of methane and carbon dioxide. Biogas can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste.

(ii) Biogas technology enables the effective use of accumulated animal waste from food production and of municipal solid waste from urbanization. The conversion of organic waste into biogas reduces production of the greenhouse gas methane, as efficient combustion replaces methane with carbon dioxide

(iii) Biogas is produced by burning of biomass while biofuel is a general term which includes biogas as well as other fuels like biodiesel.

(iv) Residues from livestock farming (manure)

Previously unused plants/plant parts (intermediate fruits, plant residues)

Explanation:

the fossil record provides evidence of a common ancestor to many species.