Can some one answer these for me please?

Select each correct answer. more than one answer may be correct. which of the following is a characteristic of unicellular organisms? they can possess tissues and organs. all of their functions are performed by a single cell. they are usually microscopic. each of their cells is specialized to perform a specific function.

Find the mass in grams of 1.37x1020 particles of h3po4

How many atoms are there in 5.70 mol of mg