Claude bernard first recognized
separate fluids outside and inside the cell
plant stomata opening and closing to maintain homeostasis
feedback loops
chemical reactions of enzymes

Answer : Option B) Plant stomata opening and closing to maintain homeostasis.

Explanation : Claude Bernand was a French Physiologist who first discovered about "homeostasis" which is defined as the controlled stability of the internal milieu, or internal environment, of cells and tissues in plants.

In plants stomatal opening and closing was done for maintaining homeostasis with the external and internal plant environment.