Pls help answer 16-21 asapp

Which event would lead to primary succession of a forest?

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass

What type of graph presents information about how often certain or traits occur?