Make an analogy for a virus and use it to describe each of the four main strategies used to produce vaccines.

Using the periodic table, complete the table to describe each atom. type in your answers.a ? b? c? d? e? f?

What is the mass of each element in a 324.8 sample of co2

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium