Examlex
A negative reinforcer is a stimulus that is __________and, thus __________ the probability of a response.
Scolex
Tapeworm head region; contains hooks and suckers for attachment to host.
Chitin
Strong but flexible nitrogenous polysaccharide found in the exoskeleton of arthropods and in the cell walls of fungi.
Integument
The outer protective layer or covering of an organism, which in animals is usually the skin, and in plants, the epidermis or outer layer.
Planaria
A genus of flatworms known for their remarkable ability to regenerate, commonly studied in research on regeneration and stem cells.
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