The mass of an atom is contained primarily in its a. electron shell b. nucleus c. proton d. size

Drag the tiles to the correct boxes to complete the pairs. match the nitrogenous base of dna with its complement.

What processes take place before the mature mrna exits the nucleus?

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.