The concepts of work, energy, and power are interrelated to meet their energy needs. Work, in biological terms, involves activities like muscle contractions during movement. Energy is the capacity to perform work, and living organisms require energy for essential functions. Power is the rate at which work is done or energy is transferred. Higher power is needed for more strenuous activities. Ultimately, the energy acquired through nutrient metabolism provides the capacity for biological work and is essential for sustaining life processes, ensuring organisms can perform activities, adapt to their environment, and maintain vital functions efficiently.