(blank)a0 is undeniably accepted by scientists all over the world as the primary language of science.

English.

Explanation:

English is undeniably accepted by scientists all over the world as the primary language of science. It is a language spoken all over the world and is also the language of science because it is an official language and can be understood by almost everyone.

Explanation:

English is undeniably accepted by scientists all over the world as the primary language of science. The scientific methods and experiments are done by communicating and writing in English. Scientists use English to communicate and share knowledge as English is understood by people from around the world.

i don't know that i agree with that but what's the question ?

compass can be used day and night, cloudy or sunny