The bear population in a national forest was monitored for ten years. The collected data for two winter months can be seen in the bar graph. Which statement would be a researcher observation from the data collected during the ten years?

C. is the answer i did the test and it was right.

a. patterns can explain observations.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.