Which of the following is the best description of convection? a. heat transfer in a gas or liquid by the circulation of currents from one region to another b. the emission of energy in the form of rays or waves that are able to travel through empty space c. the process of changing from a gas to a liquid or from a liquid to a gas d. the transmission of heat through a medium without the motion of the medium

Which of the following is the correct formula for copper (i) sulfate trihydrate? cuso4 · 3h2o cuso4(h2o)3 cu2so4(h2o)3 cu2so4 · 3h2o

Who examines and coordinates the cleanup of polluted sites?

How does the digestive system interact with the circulatory system? a. messages sent as electrical impulses from the digestive system are transported throughout the body by the circulatory system. b. nutrients taken in and broken down by the digestive system are carried to various parts of the body by the circulatory system. c. nutrients and gases are absorbed by organs in the circulatory system. then, they are transported to all parts of the body by organs in the digestive system. d. oxygen and carbon dioxide are exchanged by organs in the digestive system, and the gases are carried to the rest of the body by the circulatory system.