Can cells have different types of openings?

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

Blank allows you to do calculations for situations in which only the amount of gas is constant a)boyle's law b)combined gas law c)ideal gas law d)dalton's law

How many atoms of mg are present in 97.22 grams of mg? 6.022 × 1023 2.408 × 1024 4.818 × 1024 5.855 × 1025