three anatomy questions please help its greatly appreciated?

Question

What is the prime mover for shoulder adduction?

What part of the abdominal girdle forms the external lateral walls of the abdomen?

What muscle acts alone, and each muscle of this pair turns the head toward the opposite shoulder?

thanks again its greatly appreciated

Answer 1

Pectoralis major

External oblique?

Sternocleidomastoid (SCM)

Answer 2

Ermmm I only tell what I've learnt about till now. 4) Anaerobic respiration Haha! :D