In biology, energy is defined as the capacity to do work or cause change. It plays a crucial role in various biological processes essential for the growth, reproduction, and maintenance of organisms. Biological energy primarily comes from the sun and is captured by plants through photosynthesis. This process converts solar energy into chemical energy in the form of glucose, which serves as a fuel for all living organisms.
Once this chemical energy is produced, it can be transferred through food chains. Animals obtain energy by consuming plants or other animals. This energy is then used for various activities such as cellular respiration, movement, and maintaining homeostasis. In simpler terms, energy in biological systems is what allows living beings to perform vital functions, survive, and adapt to their environment.