Select the correct answer.What is ozone? A. dissolved oxygen B. the main catalyst in photosynthesis C. a type of oxygen D. a form of calcium carbonate

Step 1: Break Down the Problem

We need to identify which option correctly defines ozone.

Step 2: Relevant Concepts

Ozone (O₃) is a molecule composed of three oxygen atoms. It differs from the more common diatomic oxygen molecule (O₂) that we breathe. Ozone plays a significant role in the Earth's atmosphere, particularly in the ozone layer where it absorbs and scatters ultraviolet solar radiation.

Step 3: Analysis and Detail

1. Option A: dissolved oxygen - This refers to oxygen that is dissolved in water, primarily O₂, not O₃.
2. Option B: the main catalyst in photosynthesis - The primary catalyst in photosynthesis is chlorophyll, and though O₂ is produced in the process, O₃ is not directly involved.
3. Option C: a type of oxygen - This is the closest description, as ozone is a form of oxygen but it is specifically O₃.
4. Option D: a form of calcium carbonate - This is incorrect as calcium carbonate is a different compound altogether, represented by the formula CaCO₃.

Step 4: Verify and Summarize

After analyzing all options, Option C accurately describes ozone as a type of oxygen, as it refers to the specific molecular form (O₃) of oxygen.

Final Answer

C. a type of oxygen