Reaction with metals, dilute sulphuric acid and aluminum

yes, because even though a theory has a  lot of evidence to support it, it is not always true

the cell is the smallest structural and functional unit of living organisms, which can exist on its own. therefore, it is sometimes called the building block of life. some organisms, such as bacteria or yeast, are unicellular—consisting only of a single cell—while others, for instance, mammalians, are multicellular.