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coelum
ur vagina
Mollusks which have an open circulatory system, have blood that is pumped into sinuses containing tissue.
open!
Open
No, not all. Remember some arthropods are aquatic; the spiracle/trachea/tracheole system utilized by terrestrial insects is largely replaced by gills in marine arthropods.
Chitin is found in the kingdoms Animalia (animals) and Fungi. In the animal kingdom, it is found in arthropods (crustaceans, insects, etc.), mollusks, and fish (scales of certain species of fish, such as carp). It is also found in the cell walls of fungi.
Since prokaryotic cells do not have complex organelles such as a nucleus or mitochondria as do their counterparts, the eukaryotic cells. The electron transport system (ETS) for bacteria is found on the inner membrane.
arthropods.
bilateral symmetry
chelicerates
chelicerates