Which of the following prefixes means "shape"?

The prefix "morph-" derives from the Greek word "morphē," which means "form" or "shape." In various contexts, it relates to the structure or shape of organisms, objects, or concepts. For instance, in biology, "morphology" refers to the study of the form and structure of organisms. This makes "morph-" the prefix that specifically signifies "shape," aligning perfectly with the definition of the question.

Understanding prefixes can significantly enhance comprehension in various fields, especially in scientific and medical terminology, where specificity in meaning is crucial. The other prefixes provided do not pertain to the concept of shape in the same way; "mono-" refers to singularity, "meta-" indicates change or transformation, and "nucleo-" pertains to the nucleus in a biological context.