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Like all fish- through their gills.
Most aquatic arthropods have external gills
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.
Opening and closing of stomata depends on the turgid and flaccid conditions of the guard cells.If they are turgid they provide space for the passage of gases through it.While in the case of fish,it takes water in through its mouth and then passes it over the gills. there is an exchange of gases and expels out through gill covers. Here there is no usage of turgidity or turgor pressure. Great AnswerReport
Across the alveoli and capillaries.
Yes, from their mouths and over their gills
Yes, Invertebrates have respiratory system. upto phylum Annelida no special respiratory organs are found. The respiratory system first appears in phylum Arthropoda. Trachea, Book lungs, book gills are respiratory organs in Arthropodans. Mollusca have gills. Echinodermata have Tube feet, Respiratoryy tree and bursae
They breathe through lungs while on land,and by their skin while in water Through their skin.
Through their feathery gills
Some lower-order animals can also exchange gases through their skin. Frogs, for instance, when they bury themselves in the mud over the winter.
The primary function of external gills in aquatic animals is to exchanges gases. However, gas exchange is more difficult with external gills.