Select the correct answer. a girl sitting on a park bench hears a car horn honk. the noise startles her, causing her to jump. when she looks up, she sees her friend driving a car. she smiles and waves at her friend. which statement is correct? 1. being startled by a noise and waving to a friend are both reflexive actions. 2. being startled by a noise and waving to a friend are both voluntary actions. 3.being startled is a voluntary action, and waving to a friend is a reflexive action. 4.being startled is a reflexive action, and waving to a friend is a voluntary action.

The correct answer is 4. Being startled is a reflexive action, and waving to a friend is a voluntary action.

Reflexive action occurs involuntarily in a response to a stimulus whereas, a voluntary action is consciously done by a person. The person has total control on the action. A voluntary action is controlled by the brain and involuntary action is controlled by the spinal cord.

Therefore, in the given question, being startled is a reflexive action, and waving to a friend is a voluntary action.

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.