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To solve this, let's analyze the statement given in English and convert it into symbolic form.

### Given Statement
> The Ebola virus is deadly (E), but it will become a major threat to humanity (M) if and only if it becomes airborne (A) and a vaccine is not developed (V).

Let's break this down:

1. **E** stands for "The Ebola virus is deadly."
2. **M** represents "It will become a major threat to humanity."
3. **A** stands for "It becomes airborne."
4. **V** represents "A vaccine is developed."
   - **~V** represents "A vaccine is not developed."

### Translating the Logic
The phrase **"if and only if"** is a biconditional, which we can denote using **≡**. So, the phrase "it will become a major threat to humanity (M) if and only if it becomes airborne (A) and a vaccine is not developed (~V)" translates to:
\[
M \equiv (A \cdot \sim V)
\]

The overall statement then becomes:
\[
E \cdot [M \equiv (A \cdot \sim V)]
\]

### Answer
This matches the symbolic form provided in the second option:
\[
E \cdot [M \equiv (A \cdot \sim V)]
\]

### Final Answer:
The correct choice is:
**Option 2: \( E \cdot [M \equiv (A \cdot \sim V)] \)**

Would you like further details, or do you have any questions?

---

1. What is the difference between a conditional and biconditional statement?
2. How does the logical operator "and" differ from "or" in symbolic logic?
3. What does the symbol "~" represent in symbolic logic?
4. How is the statement "if and only if" represented in symbolic logic?
5. Why is the order of operations important in symbolic logic?

**Tip:** When translating English statements into symbolic form, identify key phrases like "if and only if," "and," "or," and "not" to determine the correct logical operators.

Translate the following statement into symbolic form using uppercase letters to represent affirmative English statements: The Ebola virus is deadly (E), but it will become a major threat to humanity (M) if and only if it becomes airborne (A) and a vaccine is not developed (V).

Learn how to translate complex English statements into symbolic logic with a detailed breakdown. This problem covers key concepts like conjunction, biconditional, and negation, suitable for high school students studying logic.

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