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active transport amino acids ammonia amount of water arteries autotrophic autotrophic organisms blood vessels body fluids carbon dioxide carbonic acid cellular respiration compounds concentration of salts concentration of water constant internal environment diffusion distal eliminated energy exchange surface excretory by-products excretory organ external environment false false false true filter filtration following statements true fresh-water fish gaseous exchange gills grasshopper hemoglobin heterotrophic heterotrophic organisms homeostasis hydrogen ions insect integument is/is kidney tubule knot of blood less/more loss of water lungs maintain homeostasis Malpighian tubule marine fish Mark the following materials mechanism membrane metabolic by-products Metaphytans Metazoa move nitrogen nucleic acids nucleotides occurs organic molecules oxygen plant pumps blood reabsorbed reabsorption receiving chamber soluble substances sugar system of tubes tend tracheal system transport fluid transport pigment true or false true true urea uric acid urine valves veins walls water and salts yes yes yes yes yes/no yes/no yes yes yes/no yes/no