The atomic number of an element represents the number of:
neutrons
protons
electrons
protons and neutrons

The passage that directs air to the lungs is called a. diaphragm. b. larynx. c. bronchi. d. pharynx.

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell

Which component of the earth’s atmosphere is decreased due to photosynthesis?