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a
Each F actin is a polymer of G actins
b
Each thin filament is a polymer of meromyosins
c
Each fascicle is a bundle of many muscles
d
Each myofibril contains several muscle fibres
answer is A.
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Detailed Solution
Each actin (thin) filament is made of two F (filamentous) actins helically wound to each other. Each F actin is a polymer of monomeric G (Globular) actins.