Gas exchange Crossword

Name the part of the gas exchange system that is surrounded by C shaped rings of cartilage and branches off into two further structures
Name the narrow branching structures that end in alveoli
State the specific site of gas exchange in humans
Name the muscle found between ribs
Name the sheet of muscle below the lungs that aids in breathing
What word describes breathing in
What word describes breathing out
Name the gas exchange surface in fish
What is the term given to describe the flow of oxygen in the fish gas exchange system being in the opposite direction to the flow of blood
Name the plant cells which can control the opening and closing of stomata
Name the plant cells which are the site of most photosynthesis
What does correlation mean
What name is given to a disease that can not be spread from person to person
Studying the patterns of disease to determine risk factors is called what?
A correlation does NOT prove what?