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

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

catya your not at all which answer i've seen you do this on another question!