Water in the ocean combines with carbon dioxide to form a weak acid called carbonic acid. But the ocean's pH is 8.1. on average, which is slightly basic. How is this so?
a) Water has a set pH and never fluctuates.
b) Because of ocean water's salt content, it is always basic.
c) A and B
d) There is a natural buffer system.
Question 2
Recall that the littoral zone is the area between high and low tides (also called the intertidal zone), and the sublittoral zone extends from the low-tide shoreline out to a depth of 200 meters (600 feet; also called the shallow subtidal zone).
Why are sessile, plant-like macroalgae (i.e., those attached to the ocean bottom) only found in littoral and sublittoral environments? a) They need rocks for attachment, and rocks are not found in the deep-sea.
b) They need nutrients that are found only in the littoral and sub-littoral zones.
c) They cannot survive in clear waters offshore because of excessive solar ultraviolet radiation.
d) They require light to reach the ocean bottom, which only occurs in these two zones.
e) They need to live in an area where wave energy reaches to the seafloor, which only occurs in these two environments.
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