Both lipids and carbohydrates are important in animal cell because?

This both molacules are important to human body.Because the protines and chabohydrates are give to energy for us, to do everyactivity,as breathing, running etc.

Chabohydrates

as an energy source.

as bilding box of disaccharides and polysaccharides such as moltos..

as constituents of neucleotides.

as a suger resever in milk.

Lipids..

storing foods as sourse of energy. (fats, trygliseraide.)

As a constituent of animal cell memberane.

I think you can get this answer as your answer...

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.