Humans use animals to lift weights, carry loads, pull carts, and plough fields.
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Animals engage in activities such as jumping, running, fighting, moving away from enemies, finding food, and finding safe places to live, all of which require energy.
Activities that are more strenuous require more energy compared to less strenuous activities.
Living beings need energy for activities such as playing, singing, reading, writing, thinking, jumping, cycling, and running.
All living beings need food because it provides the energy required to perform basic life processes and other activities.