Dalton's atomic theory said, apart from other things, said that an atom was the smallest things and that all matter was composed of atoms. But J. J. Thomson discovered the electrons, particles smaller than atoms, and after that, changes to Dalton's theory were made.
plants and algae. These organisms are called primary consumers or herbivores. Some examples are rabbits, deer, tadpoles, and caterpillars. organisms are called secondary consumers.
