Final answer:
Large animals like hippos spend time in water to reduce their mass, increase their weight, and reduce the effects of gravity.
Step-by-step explanation:
Large animals like hippos spend much of their time in water for several reasons. First, water reduces their mass because the buoyant force counteracts the force of gravity. Second, being in water increases their weight as the water exerts an upward force on their bodies, making them feel heavier. Third, spending time in water reduces the effects of gravity since the water supports their weight, which can alleviate stress on their bones and joints. Overall, water provides support and relief for these large animals.
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