Natural selection can operate on predator populations as well as on prey. suppose that over time trees became covered in lichen and the proportion of light moths increased to nearly 100%. what is the most likely consequence for predator populations?
a. bird populations will decrease, at least for a while.
b. over time, birds with better eyesight will become more common.
c. birds may change hunting strategies or seek other sources of food.
d. all of the above.

B:

Explanation:

due to the overtime of birds.

answer: mercury

explanation:

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.