What is an appropriate response to someone saying "merci" in French?

Read also:

• Is Europe willing to risk losing its alliance with the United States, if they choose to continue the war in Ukraine?
• Why is it difficult to get a job?
• When a black man and a white woman have a child, does the child become white? If a white man and a black woman have a child, does the child become black?
• I was awaken between 2-3am by a voice that said “Hey”. Literally right next to my ear. Sounded like a males voice, but it wasn’t stern or deep. What could this mean?
• Nintendo Switch 2: The Ars Technica review - Ars Technica
• When you visit a store, do you go to shop or buy?
• We now told, by Senator Grassley, that on the FBI form about the Biden bribery story, there is a Burisma exec who says he has 17 tapes of his deal with the Biden. 15 of Hunter and 2 of Joe Biden? What would this do to Hunter/Joe Biden if released?
• I refuse to date any women that are social media influencers, content creators, TikTok celebrities, and use Only fans. Would this be seen as normal, or would I be going too far? Why?
• What is your opinion? I am 150-152 and I feel short. I’m 15 years old. I feel like this makes me look like a baby and ugly on most clothes.
• Is depression a cause for always feeling tired?