I don't understand it can someone explain it?

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.

What are transitions between a liquid and a solid called? identify which way they are transitioning

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?