2)what animal is best adapted to life in the intertidal zone of an ocean biome? a) a porpoise b) a giant squid c) a large fish, such as a tuna d) a wading shorebird, such as a heron 3)the appearance of cyanobacteria in earth's early history resulted in an excess of oxygen in the atmosphere which fueled the evolution of complex life. in what other ways did oxygen impact earth? a) formation of rocks b) formation of mountains c) soil builds up over the rocks d) formation of rocks and mountains

D)a wading shorebird, such as a heron 

The animal which is best adapted to life in the intertidal zone of an ocean biome is a wading shorebird, such as a heron. The intertidal zone is a zone between the low and the high tide, as the word says, and while other animals, such as large fish, need big space in open water to survive, a wading shorebird is equipped for both high and low tide, making the perfect match for this kind of environment.
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A)formation of rocks 

Oxygen impacted Earth by forming rocks. Rocks could form with a process that involves oxygen as fuel for oxygenation, which is responsible for many chemical and biological process in our body, the body of animals, plant, and rocks as well, as it is what permits decay and catalyze a series of other reactions that are fundament for life on earth. 

Idont really understand