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compounds that consist of any combination of elements, but do not usually contain carbon and hydrogen together.
single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell...
non-indigenous species which reproduce and spread more rapidly than indigenous species. This...
when the body makes its own antibodies when deliberately exposed to a dead or weakened pathogen...
kingdom of multicellular eukaryotic organisms that do not have cell walls, feed...
an organic compound that always contains the elements carbon, hydrogen, oxygen and nitrogen and...