Return Nex 7 points When the Big Bang theory was first proposed, many scientists did not accept it because they did not believe there was enough evidence to support it. Which observation led to the Big Bang theory becoming more widely accepted by scientists? A. The universe appears to be shrinking. B. The universe appears to be expanding. C. The planets seem to move in elliptical orbits. O D. The planets seem to move backward in their orbits. ​

what are the two models

explanation:

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.