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a small, circular opening in the exoskeleton of insects that allows air to enter the insect's body via the trachea.
a molecule found inside red blood cells that can carry both oxygen and carbon dioxide.
the gamete-producing phase that produces the zygote from which the sporophyte emerges.
region of the kidney into which urine is discharged from the collecting ducts of the nephrons,...
is the supply of materials, in the form of food, required by organisms and cells to stay alive...