Leonardo da vinci was the first person to propose a contact lens system. in the sixteenth-century he described an optical method for correcting poor vision. da vinci’s idea was to place the eye against a short, water-filled tube sealed at the end with a flat lens. in this process, the water came in contact with the eyeball and refracted light rays much the way a curved lens does. -paraphrased from charles panati’s history of contact lenses— which sentence would most logically conclude this paragraph? a) many people wear contacts, to leonardo da vinci. b) glass remained the standard material of hard lenses until 1936. c) the first practical contact lenses were developed in 1877 by a swiss physician, dr. a. e. fick. d) da vinci’s use of water as the best surface to touch the eye is mirrored today in the high water content of soft contact lenses.

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 (7) it is about time that wereplaced our outdated and inefficient school calendars.which best revises sentence 6 to create a more appropriate and respectful tone