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competition between organisms of different species.
the remains of digestion, which are eliminated from the body via the anus, and contain...
compounds that consist of any combination of elements, but do not usually contain carbon and...
when the body makes its own antibodies when deliberately exposed to a dead or weakened pathogen...
proteins that identify and neutralise foreign and potentially harmful antigens by binding onto...
an alkaline watery fluid containing digestive enzymes, which is secreted into the mouth by...