All systems have. a. output and feedback. b. process and function. c. input, process, and sensors.

its not a choice. you dont choose if you want to be gay or straight.

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.

personal, she chose to do it.