Examlex
Which of these animals has a double circulatory system?
Callus
Thickened area of skin caused by repeated friction or pressure, or the healing tissue over a bone fracture.
Cyanosis
A bluish or purplish discoloration of the skin and mucous membranes due to insufficient oxygen in the blood.
Oxygen
A chemical element essential for cellular respiration in most living organisms.
Hemolysis
The breaking down of red blood cells, releasing hemoglobin into the surrounding fluid, often indicating damage or disease.
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