Mitosis occurs when the body needs more diploid cells, for example to heal a cut on the skin. Meiosis is the formation of 4 haploid sex cells, or gametes.
The cells of animals, plants, and fungi, as well as those of algae and other protists, all engage in cellular respiration.
- Cellular respiration is the process that all living things use to convert organic molecules into energy.
- The chemical process that breaks down food molecules to produce adenosine triphosphate, which is used for energy, is known as cellular respiration (ATP). As a result, organisms can now use energy from food molecules to perform everyday tasks.
- Oxygen is normally present when cells respire. This is called aerobic respiration. Anaerobic respiration occurs when oxygen is absent or present in very small amounts.
- Anaerobic respiration is essential to the life of some organisms, including many bacteria. Yeast and some bacteria use an anaerobic respiration process known as fermentation. The cellular respiration equation describes the process by which glucose molecules combine with oxygen to produce energy.
Therefore, all most all organisms use cellular respiration.
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B. New substances are formed. In a chemical reaction, the starting molecule must be changed or turn into another. For example: rusts that form in a tin can is a chemical reaction. The iron in the can combines with the oxygen in the atmosphere, creating rust (iron oxide), which is a different substance.
