Which is an example of a structural adaptation for a zebra? 
 A.
 The zebra herd constantly moves and is in the company of other grazers for survival.
 B.
 An adult zebra will leave its birth group upon sexual maturity.
 C.
 A zebra actively grazes during morning and late evening.
 D.
 A zebra has stripes, which allow it to hide in the tall grass.