Digestive System
Flow of organization in biological systems
What are cell, tissue, organ, organ system, organism
Name of the heart chambers
What are ventricle and atrium
The nose or the mouth
What is the start of the respiratory system?
3 things humans need to survive
What are food, water, and oxygen?
Number of chambers in the heart
What is four?
Chemical signals released by the organs of the endocrine system
What are hormones?