PLS I NEED HELP ITS IMPORTANT I AM GIVING 25 POINTS HELP PLEASE. I NEED IT FAST Why is it important for cells to be able to turn genes on and off? Select ALL Correct reasons!

Question 2 options:

A. so the cell is not too chaotic

B. so the cell can respond to the environment

C. so the cells can grow uncontrollably

D. so the cell does not waste energy

B

Explanation: Since you need this quick, its because it needs to respond to the environment. I dont remember the exact term  

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.