A train engine pulls the boxcars. What are the horizontal forces presented? A. Pull of engine friction
B. Push of engine friction
C. Pull of engine weight
D. Weight friction

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.

Which form of cell division creates the sperm and egg, resulting in half of the chromosomes as the other cells?