IB DP Biology D3.3 Homeostasis- FA 2025- IB Style Questions For SL Paper 1 IB DP PhysicsIB DP MathsIB DP ChemistryIB DP Biology IBDP Biology Paper 1 - All Chapters QuestionThe diagram shows the structure of human skin.What are X, Y and Z?Answer/ExplanationAns: C More DP Biology SL Paper 1 Questions..