Science questions for 3rd graders #shorts

In each of the following questions, four words are given. Which of them will come in the 3rd of all of them are arranged alphabetically as in a dictionary?

Short Question answer

Short Answer Question

Short Answer Question

Short Question answer

Short Answer Question

What should come in place of the question mark (? ) in the following questions ? 3/4 th of 3/5of 2/3 rd of ? = 3174

Define science in short.