21) Coordinating body functions via chemical signals is accomplished by
Athe respiratory system.
Bthe endocrine system.
Cthe immune and lymphatic systems.
Dthe integumentary system.
Ethe excretory system.
Athe respiratory system.
Bthe endocrine system.
Cthe immune and lymphatic systems.
Dthe integumentary system.
Ethe excretory system.