the ability to move from place to place
describes an organism that remains attached to a surface for its entire life and does not move
A fluid skeleton in many soft-bodied invertebrates, including annelids, that allows an organism to change shape but not volume. *
waste matter (as urine or sweat but especially feces) discharged from the body
A small, very toxic molecule (NH3) produced by nitrogen fixation or as a metabolic waste product of protein and nucleic acid metabolism.
major nitrogenous waste excreted in urine
nitrogenous waste excreted in the urine
A central cavity with a single opening in the body of certain animals that functions in both the digestion and distribution of nutrients.
usually sessile stage of the life cycle of a cnidarian that has a cylindrical body with armlike tentacles
A cnidarian body plan characterized by a bowl shape and adapted for a free-swimming life.
Two-cell layered body with a digestive cavity surrounded by tentacles that sting prey. E.g. jellyfish, hydras, sea anemones.
stinging cells that discharge when tentacles are touched
an asexual process which part of a yeast cell pinches itself off to produce a small offspring cell
in earthworms, part of the digestive system in which food can be stored; in birds, structure at the lower end of the esophagus in which food is stored and moistened
muscular digestive system structure in which earthworms grind soil and organic matter * arthropods too
external respiratory surface
skin allows diffusion of oxygen and carbon dioxide, respiratory system of earthworms
hearts: each worm has 5 pairs (10 total) that pump blood
excretory organ of an annelid that filters fliud in the coelom
An excretory organ that is unique to insects, empties into digestive tract and removes nitrogenous wastes from the hemolymph, also plays a role in osmoregulation.
open circulatory system
system in which blood is not always contained within a network of blood vessels
closed circulatory system
system in which blood is contained within a network of blood vessels
blood filled spaces found in open circulatory systems; sinuses
openings in the abdomen of an insect that are used for breathing
network of breathing tubes that extend throughout the body of most terrestrial arthropods