1) The word "guitar" contains three vowels: U, A, and I.

2) Online banking and mobile banking have become increasingly popular, providing convenient access to banking services through digital platforms.

3) The naming of cyclones varies depending on the region. For example, cyclones in the Atlantic and eastern Pacific Ocean are named using a predetermined list of names.

4) The tongue of a blue whale is so big that about 50 people could stand on it.