**Correct Option: C. The investigation of matter, its properties, and the changes it undergoes.** ### Detailed Explanation: Chemistry is fundamentally the science that deals with the composition, structure, properties, and changes of matter. Let's break down why option C is the best description of chemistry: 1. **Investigation of Matter**: Chemistry focuses on understanding what matter is. Matter is anything that has mass and occupies space. This includes everything from the air we breathe to the water we drink, and even the food we eat. Chemists study the different types of matter, which can be classified into elements, compounds, and mixtures. 2. **Properties of Matter**: Chemists examine both physical and chemical properties of substances. Physical properties can be observed without changing the substance's identity (e.g., color, melting point, boiling point), while chemical properties describe how a substance interacts with other substances (e.g., reactivity, acidity). 3. **Changes Matter Undergoes**: Chemistry also involves studying the changes that matter can undergo. These changes can be physical (e.g., melting ice into water) or chemical (e.g., burning wood). Understanding these changes is crucial for predicting how substances will behave in different conditions, which is essential in fields like pharmaceuticals, materials science, and environmental science. ### Why Other Options Are Incorrect: - **Option A: The study of the universe and celestial bodies** This option describes astronomy, not chemistry. While chemistry plays a role in understanding the composition of celestial bodies (like stars and planets), the primary focus of chemistry is not the universe itself but rather the matter that makes up everything, including celestial bodies. - **Option B: The examination of living organisms and their processes** This option pertains more to biology, specifically biochemistry, which is a subfield of chemistry. While biochemistry does involve chemical processes in living organisms, chemistry as a whole encompasses a much broader range of topics beyond just living systems. - **Option D: The exploration of historical artifacts and their composition** This option relates to fields like archaeology and materials science, which may use chemical analysis to understand artifacts. However, it is too narrow to represent the primary focus of chemistry, which is much broader and includes all matter, not just historical artifacts. ### Summary of Key Points: - Chemistry is the study of matter, its properties, and the changes it undergoes. - It encompasses both physical and chemical properties of substances. - Understanding matter and its transformations is essential for various applications in science and industry. - Other options (A, B, D) represent different scientific fields or subfields, not the primary focus of chemistry. By understanding these concepts, students can appreciate the vast scope of chemistry and its importance in both scientific inquiry and practical applications.