Unicellular organismas take in oxygen and pass out carbon dioxide through

Passing carbon dioxide through lime water

State the importance of oxygen and carbon dioxide.

Combustion consumes oxygen and releases carbon dioxide.

Calcium carbonate can be prepared by passing carbon dioxide through ….A.. Or by the addition of sodium carbonate to ….B…. Here, A and B refer to

What is wrong in the statement “We breathe in oxygen and breathe out carbon dioxide"

Breathing is the process of intake of oxygen-rich air and giving out carbon dioxide-rich air. The process of taking-in oxygen-rich air is known as

Oxygen, carbon dioxide, and light.

In humans, carbon dioxide is excreted through____

How is oxygen and carbon dioxide transported in human beings ?