Read the passage. North American river otters are a species whose population can indicate the degree of health in the surrounding environment. The otters experienced a sharp decrease in numbers in the 1900s. This was due to fur trapping and pollution. They are not considered endangered today, though.

Which sentence could be added to the passage to maintain its formal style?

Through conservation efforts, the otter population has recovered.

Fur trapping and pollution are legal today.

The otter is on the endangered species list.

If people would leave otters alone, they would be healthy.

Read the rough draft of a student's conclusion to anargumentative editorial.(1) year-round schooling would student achievement.(2) not so much information would have to be crammed intonine months. (3) furthermore, the elimination of long breaks,particularly summer break, would significantly reduce"learning loss" and the additional time wasted at thebeginning of each academic year to reteach previouslylearned material. (4) it is clear that year-round schooling students learn and retain more. (5) the united staleis not the only country to experiment with a year-roundschool schedule. (6) although many still claim that evidenceabout year-round school and its link to higher achievement isinconclusive, these people need to open their eyes and seethat students in these schools consistently score higher oncertain assessments than students who attend schools withtraditional nine-month calendars. (7) it is about time that wereplaced our outdated and inefficient school calendars.which best revises sentence 6 to create a more appropriate and respectful tone