What are the major groups of microorganisms

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

Suppose the universe were completely empty except for one object-a solid sphere moving through space of 100 km/s. what sort of path would the object be moving in? explain your answer