When a bumblebee lands on a flower, it pumps its abdomen up and down to move oxygen into its system of ________ through the round holes called ________ on its abdomen.
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Q66: Fish gills consist of a series of:
A)parabronchi.
B)opercula.
C)spiracles.
D)interconnected
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Q73: The surface area of all respiratory systems
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A)Steep concentration gradients
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