Before nitrogen gas can be used by living organisms it must be converted into ammonium. This important step of the nitrogen cycle is known as 1. ammonification
2. denitrification
3. ozonation
4. nitrification​

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Time remaini 02: 50: 5 in the farewell speech, queen elizabeth's use of first-person point of view her to appear to be impartial and objective prevents her from addressing the audience directly allows her to share her personal thoughts and ideas, makes it seem as though she's observing from the outside, mack this and return save and evit

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome