Students are studying how the color of a group of beetles changes. Population of Beetles
25
20
Number of Beetles
(thousands)
15
10
0
Time
Which two statements support the explanation that natural selection caused the color change in the beetles?
A. The beetles' surroundings became lighter.
B. Fewer beetles with dark coloration survived to reproduce.
C. The gene that produces dark coloration became more common.
D. Beetles with light coloration found a more nutritious food source.
E. Beetles with dark coloration became better able to hide from predators.

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.  

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .

the correct answer is c