Final answer:
Macroevolution refers to bigger evolutionary changes that result in new species. It can occur through repeated microevolution or major environmental changes.
Step-by-step explanation:
Macroevolution refers to much bigger evolutionary changes that result in new species. It can occur when microevolution takes place repeatedly over a long period of time and leads to the creation of a new species.
Additionally, major environmental changes can also lead to macroevolution by causing large changes in the traits of a species through natural selection.