¿En qué medida al variar las cantidades de los elementos y sustancias químicas en los ciclos biogeoquímicos se producen alteraciones? explica.

**40** points asapessay questions (10 points possible) clear image of next, create your own scenario. it can be one of your own real experiences or one you make up. use imagery in your writing to give your instructor a the setting and an action taking pace in your writing explain the structure and functions of the skin at work in your scenario. !

Check the correct box to describe the periodic trends in electronegativity. electronegativity across a period: decreases. increases. electronegativity down a group: decreases. increases.

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.