Although it is lower in energy than the food from which it is derived, feces may retain a large amount of energy, often 50% of that of the original food. This means that of all food eaten, a significant amount of energy remains for the decomposers of ecosystems.
Image: Specialised organelles. Every cell in your body contains organelles (structures that have specific functions). Just like organs in the body, each organelle contributes in its own way to helping the cell function well as a whole. The nucleus, mitochondria and chloroplasts are all organelles.very cell in your body contains organelles (structures that have specific functions). Just like organs in the body, each organelle contributes in its own way to helping the cell function well as a whole.
A cell can be thought of as a mini-organism consisting of tiny organs called organelles. The organellesA structural or functional unit in a cell that is constructed from several macromolecules bonded together. are structural and functional units constructed from several macromolecules bonded together. Cells are the basic structural and functional unit of all life. 2  Examples include red blood cells and nerve cells. 3  Tissues. 4  TissuesA group of cells that share a common structure and function and that work together. are groups of cells that share a common structure and function and work together.