What is the relationship of a field of science and a topic in science? Select one:

a.
A field of science is an organized approach to study an area of specialization. A topic is one subject matter a field will study.

b.
A topic is one theme that can be studied by several fields of science.

c.
Both answers A and B are correct.

d.
Topics and fields are identical.

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.