Multiple choice questions XIII — task. Science CBSE, Class 10.

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1. The main advantage to bipedal locomotion is

Availability of hands for other uses
Better body balance
Reduced weight
Increased speed

2. At the time of origin of life which was not existed on free stage

\(O_2\)
\(H_2\)
\(NH_3\)
\(CH_4\)

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