The idea that light can act as packets led to what new field of science? A. Quantum mechanics
B. Nuclear mechanics
C. Electrical mechanics
D. Physical mechanics

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.

answer: they produce more slow than unicellular organisms.