Depends on your options. I would go with one that is single-celled, like a bacterium
Answer:
Through the process of cellular respiration, the energy in food is converted into energy that can be used by the body's cells. During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, and the energy is transferred to ATP.
There are many factors, but some may include loss of food, loss of sunlight, survival of the fittest, where one species may dominant the other, resulting in the extinction of the weaker species, and changes in the environment, such as climate change.
DNA stands for Deoxyribonucleic Acid, so it's an acid
The answer to the question that is being stated above would be 'model. A model is a hands-on representation of an actual object. It can also be called as a 'physical model', specifically, if you're referring to a bigger or a smaller representation of an actual object.