Which definition is correct? A. a physical change creates a new substance because bonds are broken or formed
B. a physical change can happen without changing any characteristics of the substance
C. a chemical change occurs when the substance remains the same but the shape, or other physical characteristics change
D. a chemical change produces a new substance by breaking and forming new bonds

Whereas a change that causes change in chemical composition of a substance is known as chemical change. For example, A new substance is always formed in a chemical change. Thus, we can conclude that the definition a chemical change produces a new substance by breaking and forming new bonds, is correct.

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.