Examlex
A late collision with a large planetesimal may have caused what feature on Mars?
Book Lungs
Respiratory organs in certain arachnids, such as spiders and scorpions, consisting of stacked plates for gas exchange.
Operculum
In bony fishes, a protective flap of the body wall that covers the gills.
Swim Bladders
Gas-filled sacs in fish that help maintain buoyancy in the water column.
Countercurrent Exchange
A mechanism in organisms where two fluids flow in opposite directions, exchanging properties (such as heat or solutes) to allow for efficient transfer.
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