How did schleidenis research differ from
schwann's research?
© each used a different procedure to examine
cells.
© each used a diferent type of instrument to
examine cells
one examined single-celled organisms and
the other examined multicellular organisms.
one examined plant cells and the other
examined animal cells

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

answer; talc and gypsum;

what is the question?

the pseudoscience are like beliefs, theories, or like practices that are considered scientific