End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
http://interfile.ir/file/41655/پاورپوینت-فصل-اول-علوم-هشتم-مواد-و-جداسازی-مواد