고1 문젠데 풀다보니 답이 아리송하네요.
답과 설명 부탁드려요.

2. 낱말 쓰임이 적절하지 않은 것은?
the scientific principle of osmosis can be seen in a simple experiment. the first thing you need is about 8 centimeters of tubing made of a permeable membrane, which you should ①wet thoroughly. next, ②tie the tubing at one end to create a bag, and then fill it with sugar water. this liquid should contain about 20 % sugar. with the bag nearly full, attach the open end to the ③top of a long plastic tube. now set the plastic tube onto a ④stand and place a large container of purified water beneath the bag. finally, ⑤lower the bag into the water, and watch what happens. the power of osmosis will cause the purified water to flow into the bag, forcing the sugar water up into the plastic tube. 1. it 넷과 다른거. 제 눈엔 왜답이없는거 같은데,, 답이 있을까요?
one of the simplest animals you will ever see is a sponge. it has no head, mouth, arms, or legs. instead, it just consists of many tiny cells growing very near each other. each of the various kinds of cells in it does something different. some make up the skeleton of the sponge and give it its shape, while others play a protective role. there are some cells that push water around to make it flow through holes located in other structures. there are even some cells that are used only for reproduction. sponges generally live in the sea, but there are a few species that inhabit fresh water. some live alone, while others gather together in colonies.