Arthropods, including insects, arachnids, crustaceans, and millipedes, are a diverse and successful phylum with a segmented body and appendages. They make up 80% of animal species, have a dorsal heart and ventral nervous system, and are covered in an exoskeleton. Oxygen levels limit their size, but they have existed since the Cambrian period and pursue […]
Arthropods make up 80% of living species and have a 600 million year history. Extinct arthropods have been discovered as fossils, including the famous trilobite and sea scorpions. Arthropods were the first terrestrial animals to leave fossils and evolved alongside plants. Larger arthropods evolved during the Carboniferous period, including dragonflies and millipedes. Their size is […]
