What is the name of the part of a cell that allows molecules in in, such as glucose and oxygen?

One does not belong why? ice, gold ,wood ,diamond and table salt

How many moles of al3+ ions are in 1.25 moles of al2o3

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.