Final answer:
Jean-Baptiste Lamarck proposed the two laws of the inheritance of acquired characteristics, which suggested that modifications in an individual's lifetime could be inherited by offspring and bring about change in a species. However, this theory has been discredited in modern biology.
Step-by-step explanation:
The two laws of the inheritance of acquired characteristics were proposed by Jean-Baptiste Lamarck. According to Lamarck's theory, modifications in an individual caused by its environment or the use or disuse of a structure during its lifetime could be inherited by its offspring and bring about change in a species. However, it is important to note that Lamarck's theory has since been discredited in modern biology.