Next, students fill in blanks — like in a Mad Libs worksheet — to help create a main idea statement. And finally, they practice expanding on that idea with relevant details to form a summary. Related: ...

This process requires specialized organs such as the lungs or gills. This oxygen is used for cellular respiration and metabolism, a byproduct of which is carbon dioxide.

Save guides, add subjects and pick up where you left off with your BBC account. Revising cellular respiration? Test your knowledge with this Higher Human biology quiz.

The heartbroken Irish wife of an Australian who was jailed in Iraq has revealed he has ‘passed out’ on numerous occasions in the past three weeks due to the poor conditions in prison. Desree Pether, ...