Plants and animals get energy from food to carry out their activities. However, only plants other chlorophyll bearing organism such as algae and certain bacteria can make their own food. They are called autotrophs. Animals , including himans depend on plants and other animals as source of energy. Organism that consume food for their energy supply are called heterothrops.
Grass makes food using energy from sunlight through the process of photosynthesis. Thus, they are autotrops. In turn, the goats eat grass and are heterotrophs. Both grass and goats need stored energy in food which has to be released before it can be used. Organism, whether autotrophs, released stored energy in food through the process of respiration. Respiration occurs in the celk of organism.
Respiration
Breathing and respiration are two related processes with different meanings. Breathing is the exchange of gases between organism and the environment. For example, when you enhale, air flows into your lungs. When you exhale, air from the lungs leave your body. A constant supply of air into your lungs, specifically oxygen, is essential for you to stay alive. This is because oxygen plays a critical role in the processof respiration.
Respiration is the release of energy through the breakdown of food molecule in the presence of oxygen. It takes place in the cell which is why some biologist use the term cellular respiration to differentiate it from breathing.
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