________ is a compound made up of two elements-hydogen and oxygen.

Options

A. Carbon dioxide
B. Water
C. Ozone
D. Hydrogen dioxide

Answer

To solve the question, "________ is a compound made up of two elements - hydrogen and oxygen," we will follow these steps:

### Step 1: Identify the Elements
The question specifies that the compound is made up of two elements: hydrogen and oxygen.

### Step 2: Determine the Ratio of Elements
The question implies that the compound consists of two hydrogen atoms and one oxygen atom. This can be represented in a chemical formula.

### Step 3: Write the Chemical Formula
Based on the ratio identified in Step 2, the chemical formula for the compound would be H2O, where:
- H (hydrogen) has a subscript of 2, indicating there are two hydrogen atoms.
- O (oxygen) has a subscript of 1, indicating there is one oxygen atom.

### Step 4: Identify the Compound Name
The compound with the chemical formula H2O is commonly known as water.

### Final Answer
Thus, the answer to the question is: **Water**.

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