Give the correct answer to the following questions:
Shwetha was playing in the garden when a red ant bit her. She felt a burning sensation and her skin turned red. Her brother applied moist baking soda on the affected area, and she soon felt relief.
1. What is the nature of the substance injected by the ant?
2. Why did baking soda provide relief?
3. Which of the following substances can also be used for similar relief?