The derived trait which evolved to overcome the effect of gravity on animals moving on land is the evolution of stronger limbs with more muscle, which means that option C is the right answer.
Stronger limbs are very important for animals as they help in running, climbing, walking or paddle swimming. It also helps them in tearing flesh, and helps in balancing the weight of the body, which enables them to move smoothly. Animals without limbs are called invertebrate and they lack legs due to which they can just swim in water. Their movement is by crawling or sliding. The presence of limbs allowed the transition of life from aquatic to terrestrial. The anatomy of limbs also helps to identify relation with other animals which are present or extinct.
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