Over the course of the passage, the main focus shifts from A
a critique of the treatment of children to a
depiction of a particular child's situation.
B
observations of a character's mental state to a
domestic reunion.
the opinions stated by one character to the
opposing views asserted by another.
the description of a character's past to a
prediction about the character's future.

Oceans produce approximately 80 percent of the oxygen our planet needs to support animal life. pollution that reaches the ocean through dumping, oil leaks, runoff, and other processes interferes with that oxygen production and poses a real threat to the oxygen content in our atmosphere. if the oxygen content decreases, it is likely that carbon dioxide will increase. this could have dramatic consequences for life as we know it. which does this passage indicate causes a decrease of oxygen in the atmosphere?