Which example of observations would provide a scientist with the best data for planning a new investigation about plant growth?
A: The scientist observed that, after exactly four weeks, the lima bean plant labeled "C" in soil was 3.25
inches taller than the other plants.
B: The scientist observed that after exactly four weeks, the bean plant in the darker soil was about 3
inches taller than the other plants.
C: The scientist observed that after about a month, the green plant in some soil looked taller than the
rest of the plants.
D: The scientist observed that after about 30 days, the bean plant labeled "C" in the soil was a couple of
inches taller than most of the other plants.
HEL

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.  

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.

it is a solid

explanation: