Gravity would have the least effect on the movement of which of the following? (Explain your answer.) a. a salmon a. a snake a. a sparrow a. a grasshopper

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1. Identify the environments in which each animal typically moves. Salmon are aquatic and move in water, snakes are terrestrial and move on land, sparrows are aerial and move in the air, and grasshoppers are also terrestrial but can jump and briefly move through the air.
2. Understand how gravity affects movement in different mediums. In water, buoyancy counteracts gravity, so aquatic animals like salmon experience less gravitational pull when compared to terrestrial animals.
3. Consider the impact of gravity on aerial movement. Birds, such as sparrows, while being affected by gravity, spend a significant amount of time in flight where gravity is counteracted by lift generated by their wings.
4. Analyze the effect of gravity on animals that jump, such as grasshoppers. Although they can momentarily defy gravity through jumping, they are still significantly influenced by gravity, especially when they land.
5. Conclude which animal's movement is least affected by gravity by comparing the counteracting forces each animal experiences in their respective environments. Aquatic animals like salmon are supported by buoyant forces in water, making gravity's effect on them relatively minimal compared to animals that move primarily on land or in the air.