Triops is a genus of small crustaceans in the order Notostraca (tadpole shrimp). Some species are considered living fossils, with a fossil record that reaches back to the late Carboniferous, 300 million years ago. One species, Triops longicaudatus, is commonly sold in kits as a pet.
Innate immunity is found in both animals with and without adaptive immunity. The molecular components of the innate immune system do not appear to be closely related to the molecules of the adaptive system.
Both the function and efficiency of the innate immune system do not change with repeated exposure to foreign pathogens. Browse Abcam's products to study innate immunity. The adaptive immune system. The adaptive immune system is activated when the innate system fails to clear pathogens from the body. It consists of a variety of cells and molecules, among which lymphocytes and antibodies are the key elements. Lymphocytes arise continuously from progenitor cells in the bone marrow.