Hilda and her family are going on a sailing trip this summer, and hilda is especially interested in spotting dolphins. in which zone of the ocean is hilda most likely to spot dolphins? hilda and her family are most likely to spot dolphins in the (blank )zone. to view shorebirds and crabs, hilda should move towards the (blank) zone

The first blank can be filled with the pelagic zone and the second blank can be filled with the intertidal zone.  

The pelagic zone comprises the water column of the open ocean and can be further differentiated into the regions by depth. Dolphins are witnessed in the pelagic zone of the ocean. The intertidal zone also called littoral zone, refers to the region of the seabed and foreshore, which comes into contact with the air at low tide and submerged at high tide, shorebirds and crabs are witnessed in this zone.  

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.