for example elephant isn’t the same size as a sheep
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Evolution is guided by natural selection. An elephant’s environment has lots of plant-based food, but also lots of large, dangerous predators. It turns out that being absolutely massive is a viable niche to fill because they tend to get enough food, and their size and strength are defense against predators.
Some other animals find being small to be advantageous. A mouse eats very little, and being small and quick allow it to evade predators either by speed and agility, or hiding where they can’t go.
Finally, there’s no reason why everything should be the same size. Some would conclude that life has not gone according to a grand plan, but the life forms that emerge do so just because that’s what worked first.
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