I think the answer you are looking for is peer review.
Answer should be A if multiple choice
The last one
some cells are living and some cells are not
i think
Answer:
a) 12 neutrons
Explanation:
The atomic mass is 22.990, which can be rounded to 23 and is the combination of protons and neutrons. The atomic number is 11 (protons), and 23-11=12, whoch would be the neutron number
Hope this helps :)