GED Science Practice 2025 - Free GED Science Practice Questions and Study Guide

The term that describes having no definite form or distinct shape refers to something that is amorphous. In this context, the correct answer signifies a lack of defined boundaries or structure, which is a fundamental characteristic of certain physical states or substances. For instance, liquids can take the shape of their container, and gases expand to fill the available space, thus exhibiting amorphous properties.

The other choices represent distinct scientific concepts unrelated to the idea of form or shape. For example, the maximum value of a wave pertains to amplitude in physics and has no relevance to shape. Similarly, the lack of a normal number of red blood cells refers specifically to anemia, a medical condition, which does not pertain to the concept of form. Lastly, fermentation in the absence of oxygen describes a biological process known as anaerobic respiration, again not connected to the notion of definite shape or form.