Which of the following is NOT a principle of biology?

The correct answer is based on the understanding of various biological principles that govern the functioning of living organisms. One fundamental principle is that cells are the simplest units of life, meaning that all living things are composed of cells. Similarly, maintaining homeostasis is crucial for the survival of organisms, as it involves regulating internal conditions despite external changes. Lastly, reproduction through genetic material is a key characteristic of life, allowing species to pass on traits to their offspring.

However, the statement that all organisms can photosynthesize is inaccurate. Photosynthesis is a specific process used by certain organisms, primarily plants, algae, and some bacteria, to convert light energy into chemical energy. Many living organisms, such as animals and fungi, do not have the capability to photosynthesize; instead, they derive energy through different metabolic processes, such as respiration or decomposition. Therefore, the idea that all organisms can photosynthesize does not hold true, making it the option that is not a principle of biology.