Mitosis is a type of cell division that produces cells that are identical to the parent cell. Meiosis is a different type of cell division that produces cells that carry half the genetic material of the parent cell.

Based on the information provided, how do the purposes of mitosis and meiosis differ?
A.
Mitosis is only used by multicellular organisms, while meiosis is only used by single-celled organisms.
B.
Mitosis creates cells used for reproduction, while meiosis produces cells used for growth and repair.
C.
Mitosis produces cells used for growth and repair, while meiosis produces cells used for reproduction.
D.
Mitosis is only used by single-celled organisms, while meiosis is only used by multicellular organisms.

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.  

the answer is d.) potassium

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.