Earth’s atmosphere is important to living things because it: A. contains dust and other particles.
B. is very thin compared to the size of Earth.
C. provides all the gases that living things need to survive.
D. maintains a constant relative humidity.

The chemical effect of the endocrine system is longer lasting than the chemical effect of the nervous system. select the best answer from the choices provided t f

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano. the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? a.positive force, balanced force, negative force b.negative force, balanced force, positive force c.positive force, unbalanced force, negative force d. negative force, unbalanced force, positive force