AP BIOLOGY

Detailed explanation-1: -part, piece, portion, segment, section, fraction, fragment refer to something that is less than the whole.

Detailed explanation-2: -The structure of something is the way in which it is made, built, or organized.

Detailed explanation-3: -structure. / (ˈstrʌktʃə) / noun. a complex construction or entity.

Detailed explanation-4: -A structure is an arrangement and organization of interrelated elements in a material object or system, or the object or system so organized. Material structures include man-made objects such as buildings and machines and natural objects such as biological organisms, minerals and chemicals.