Identify the structures of skeletal muscle.

The top box is the Myofibril. The second box towards the right (a little on the bottom of the first one) is the muscle. The third box  all the way to the left is the myofilament. The fourth box on the right of the htird (towards the middle) is the muscle fibers. The last box (on the right, at the bottom) is the fascicle.

Skeletal muscle is one of the major muscle types in most animals specialized to perform movement of the human body, maintaining body posture and generation of body heat present in different sizes and shapes.

The main structure of skeletal muscle cells consists of various integrated tissues:

1. Muscle: soft, contractile tissue important to produce force and motion in animals.

2. Fascicle:  multiple bundles of skeletal muscle fibres which is surrounded by a type of connective tissue called perimysium.

3. Muscle fibres: bundles of cylindrical organelles myofibrils formed by the fusion of myoblasts via myogenesis process.

4. Myo-fibril: basic unit of a muscle cell made of thick and thin myofilament arranged in parallel columns along the length of muscle fibres.

5. Myo-filament: strands of actin and myosin proteins which pack a muscle fiber and are  force generating structures.

Thus, the structures are correctly labelled.

what are the choices?

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.