Oh, they're not. Crustaceans are arthropods too, and they're aquatic. Almost all insect species fly. They're everywhere.
No, not all. Remember some arthropods are aquatic; the spiracle/trachea/tracheole system utilized by terrestrial insects is largely replaced by gills in marine arthropods.
Terrestrial arthropods have a series of openings called spiracles at the body surface. Spiracles open into tiny air tubes called tracheae, which expand into fine branches that extend into all parts of the arthropod body
Not all arthropods use spiracles to obtain oxygen, but many do. Spiracles are openings on the exoskeleton that lead to a network of tracheae, allowing gas exchange. Aquatic arthropods, such as many crustaceans, typically use gills instead of spiracles for respiration. Therefore, while spiracles are common in terrestrial arthropods, they are not universal among all arthropods.
external sexual
They express the characteristics inherent to arthropods. All insects are arthropods. Not all arthropods are insects.
Terrestrial arthropods excrete metabolic wastes in the form of uric acid, which is solid and fairly dry. Aquatic arthropods excrete ammonia through gills or other membranes.
B. Herting has written: 'A catalogue of parasites and predators of terrestrial arthropods'
Terrestrial biomes Arthropods live in just about every habitat (if not every habitat) on the earth: Terrestrial which include: desert, forrest, grassland and tundra and Aquatic which include: freshwater and marine,
They express the characteristics inherent to arthropods. All insects are arthropods. Not all arthropods are insects.
Terrestrial arthropods primarily excrete nitrogenous waste in the form of uric acid, which conserves water and is less toxic, making it suitable for their drier environments. In contrast, aquatic arthropods generally excrete ammonia directly into the water, as it is highly soluble and can be diluted easily, reducing toxicity. This difference in excretion methods reflects their adaptation to diverse habitats, with terrestrial arthropods prioritizing water conservation.
The term terrestrial usually just refers to something that lives on land. Ants, flying insects, woodlice, spiders, are all mostly land-dwelling arthropods.
Yes, all arthropods have brains.