????the savanah hypothesis causes human to walk upright.
The savannah hypothesis causes human to walk upright. This is correct grammar, but does not make sense in terms of meaning. A hypothesis is merely a suggestion or theory, and a suggestion or theory did not cause humans to walk upright.
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The savannah hypothesis causes human to walk upright. This is correct grammar, but does not make sense in terms of meaning. A hypothesis is merely a suggestion or theory, and a suggestion or theory did not cause humans to walk upright. To cause something means to make it actually happen
A more accurate sentence is this. The savannah hypothesis suggests / argu