Our understanding of the atom has changed over time. which idea that was once accepted is now considered scientifically inaccurate?
a. the nucleus is the center of the atom.
b. an atom is solid material.
c. electrons are arranged in layers.
d. electrons have a negative charge.

Based on the trends shown in this chart, which of the following predictions best tell about the u.s. population in 2020? (3 points) i. more than half of the u.s. population will live near an interstate highway. ii. less than one-quarter of the u.s. population will live in urban areas. iii. more than half of the u.s. population will live in suburban areas. i only iii only i and iii only ii and iii only i, ii, and iii