What is a close relationship among 2 species of organisms that live in the same environment?

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Arrange the elements in order of increasing electronegativity. use the periodic table to you arrange the elements. p o k mg

What are the coefficients to balance the following equation? ba+br=babr2