write a note in the how aquatic animals and insect move?
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Answer:
An aquatic animal is an animal, either vertebrate or invertebrate, which lives in the water for most or all of its lifetime.[1] Many insects such as mosquitoes, mayflies, dragonflies and caddisflies have aquatic larvae, with winged adults. Aquatic animals may breathe air or extract oxygen that dissolved in water through specialised organs called gills, or directly through the skin. Natural environments and the animals that live in them can be categorized as aquatic (water) or terrestrial (land). This designation is polyphyletic.
Explanation:
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One problem that aquatic insects must overcome is how to get oxygen while they are under water. All animals require a source of oxygen to live. Insects draw air into their bodies through spiracles, holes found along the sides of the abdomen. These spiracles are connected to tracheal tubes where oxygen can be absorbed. All aquatic insects have become adapted to their environment with the specialization of these structures
Aquatic adaptations
Simple diffusion over a relatively thin integument
Temporary use of an air bubble
Extraction of oxygen from water using a plastron or physical gill
Storage of oxygen in hemoglobin molecules in hemolymph
Taking oxygen from surface via breathing tubes (siphons)
The larvae and nymphs of mayflies, dragonflies and stoneflies possess tracheae but when in larval stage the tracheae are connected to gills, which are very thin extensions of the exoskeleton through which oxygen in the water can diffuse.