ls -h command in mac osx Catalina 10.15.2 not working

I’m a newbie and this is probably a very newbie question be forewarned. When using terminal in zsh mode, entering ls -h does not output the expected result. Instead I receive an output as if I just entered ls without the -h. What could be the cause of this? Does ls -h not function the same in zsh mode?

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Author: zaddy