The passage reports that science requires _________.

All of human work can be divided into two parts: the arts and the sciences. The sciences, in general, are those parts of human work that require "knowledge". More specially, science requires observation (watching the natural world), identification (separating and naming the parts of a naturally occurring thing), description (using words to make a picture), experimentation ( trying to copy what occurs in nature to learn from it), and theoretical explanation (forming a set of ideas, a theory, that accounts for the occurrence).
     The arts, on the contrary, are those areas of human endeavor that require skill. Skill is a person’s ability to work well with a part of his or her body. Skill is talent and technique. An artist is someone who does something well or makes something well using hands and tools. Artistry is also a well-developed skill in one area of manufacture. Everything that was not "natural" was artificial, that is, made with tools through skill by hand.
    Today the word art has a special meaning. Art is that which is beautiful: the painting of skilled painters, for ex- ample, is enjoyed and appreciated by many people. Weaving rugs and tapestries is another art. Ceramic work is also art: the shapes, colors, and textures of bowls, vases, and pitchers make these clay items beautiful to look at and enjoyable to use.