Question

1) source of energy of sun is
a)nuclear fission
b)nuclear fusion

2) main constituent of biogas is
a) CO2
b)H2
c) methane​

Answer 1

Explanation:

1 = nuclear fusion

2= biogas contain primarily contain methane and co2 but u can write methane

Answer 2

Explanation:

1.nuclear fusion is the source of energy of sun

nuclear fusion is nothing but the process of a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.

2.co2 is main constituent of biogas

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