The process which breaks down food to release energy with the help of oxygen and respiratory enzymes is called:

Respiration is a _______ process.

  ____________is a cellular respiration that occurs without oxygen.

A part of respiration

Insects do NOT have

We breathe air into our______________and the  chest expands.

__________ is the process of releasing energy by breaking down food for the life process.

In humans giving out of carbon dioxide during breathing is called:

How do earthworms breathe?

An organism used in the  making of bread