What is the normal job of myostatin

Myostatin inhibits both myoblast cell proliferation and differentiation, reducing fiber number during muscle formation. McCroskery et al. demonstrated that myostatin is expressed in satellite cell and adult myoblast cell using muscle tissue from normal and myostatin-null mice.

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects

c is the correct answer hope this !