How are Van Allen belts formed?

What does the cell nucleus do or, how does it function?

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.

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure