What is the aging process of a star called

In what for do plants utilize nitrogen? why do they need nitrogen?

Which is an example of a decomposer? a. bear b.algae c.grass d.bacteria d bacteria

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi,r^3 , where r is the sphere’s radius.