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The gills of a mushroom house the basidia, the cells on which the spores are produced. The gills function as a large surface area over which to produce millions of spores that is exposed air yet protected from large fluctuations in air temperature, moisture, etc.
To exchange for oxygen in water.
Aquatic arthropods mostly exchange gases through (c) gills; some (like the horseshoe crabs) have book gills. The "book lungs" term usually applies to most arachnids like scorpions and spiders, which are terrestrial; most other terrestrial arthropods exchange gases through special holes in their segments called spiracles, attached to the tracheal tubules/tracheola which connect directly to the tissues.
gills
The Gills
Gills.
in their gills.
gills
Gills
Through their feathery gills
Across the alveoli and capillaries.
Carbon Dioxide