for example elephant isn’t the same size as a sheep
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Every animal question on this sub is an evolution question. Do students seriously not learn evolution anymore?
Animals are different because the exact circumstances they live in will differ. Certain properties are a better fir to the environment than others, so animals with those characteristics will pass on their genes more than those who don’t have those traits.
A creature might be smaller to better suit the nutrition and energy required to maintain their mass. A creature with more access to food and more opportunity to eat may eventually lead onto larger sizes later in its evolution, especially if the larger size benefits them in their environment, such as being harder to kill by predators. A small elephant is easily picked off, which means the genes of larger elephants tends to carry on.
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