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Blood flow in the gill filament of a fish moves in the opposite direction of the water.Why does this flow make sense considering where the gas exchange is occurring?
Immune System
The complex network of cells, tissues, and organs in an organism that works together to defend against foreign substances, pathogens, and diseases.
Voluntary Risk
The risk a person willingly takes after weighing the potential benefits and dangers, often seen in activities like investments, extreme sports, or elective medical procedures.
Hang Gliding
A recreational and competitive air sport in which a pilot flies a light and non-motorised foot-launched heavier-than-air aircraft called a hang glider.
Control Group
In experimental research, a group of subjects that does not receive the treatment being tested, serving as a benchmark to measure how the other tested groups do.
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