Not always. When they don't they die.
through carbohydrate containing foods
Animals and humans eat food to stay alive. Metabolic processes break down the food (plants and animals) to obtain energy, and the materials needed to build and repair the body.
Most animals produce carbon dioxide through a process called cellular respiration. During this process, cells break down glucose to obtain energy, releasing carbon dioxide as a byproduct. The carbon dioxide is then expelled from the body through respiration or other methods like diffusion in aquatic animals.
During cellular respiration, animals primarily take in oxygen and glucose. Oxygen is essential for the process of aerobic respiration, allowing cells to produce energy, while glucose serves as the main source of chemical energy derived from the food they consume. Together, these materials enable cells to generate ATP, the energy currency of the cell.
All cells obtain energy from cellular respiration. Some undergo anaerobic respiration and some undergo aerobic respiration.
cellular respiration.
Animals, fungi, and most bacteria are examples of organisms that use cellular respiration but do not perform photosynthesis. These organisms obtain energy by breaking down organic molecules like glucose to produce ATP through cellular respiration.
Plant cell respiration uses the products of the photosynthetic process to produce adenosine triphosphate, or ATP. This chemical is a source of energy for all cells, both plant and animal, and is produced in the mitochondria using the cell respiration process. In plants, this process involves the mitochondria breaking down and recombining thesugar and oxygen created during photosynthesis. This recombination oxidizes the sugar, chemically burning it and releasing the energy. In plants, cellular respiration requires six oxygen molecules and one sugar molecule to create six water molecules, six carbon dioxide molecules and 36 units of ATP. The carbon dioxide and water can then be recycled to repeat this process. Creds to http://www.ehow.com/info_7931699_cellular-photosynthesis-between-plants-animals.html
For cellular respiration, a bear primarily needs glucose and oxygen. Glucose is obtained from the carbohydrates in the food it consumes, while oxygen is inhaled from the air. These materials are essential for the bear to convert nutrients into energy, which fuels its bodily functions and activities.
In Cellular Respiration, we get energy from the plants and animals we consume. So we indirectly obtain energy from the sun.
They conduct only respiration. Animals are not photosynthetic.