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A chordate (/ ˈ k ɔːr d eɪ t / KOR-dayt) is a deuterostomal bilaterian animal belonging to the phylum Chordata (/ k ɔːr ˈ d eɪ t ə / kor-DAY-tə).All chordates possess, at some point during their larval or adult stages, five distinctive physical characteristics (synapomorphies) that distinguish them from other taxa.
The calcichordate hypothesis, formulated by British Museum paleontologist Richard Jefferies, holds that each separate lineage of chordate (Cephalochordates, Urochordates, Craniates) evolved from its own lineage of mitrate, and thus the echinoderms and the chordates are sister groups, with the hemichordates as an out-group. [1]
This is most common in women over 40 years of age. Known risk factors include obesity, hypertension and diabetes. [10] Flat feet can also occur in pregnant women as a result of temporary changes due to increased elastin (elasticity) during pregnancy; if developed by adulthood, flat feet generally remain flat permanently.
Tunicates are the only chordates that have lost their myomeric segmentation, with the possible exception of the seriation of the gill slits. [8] [9] However, doliolids still display segmentation of the muscle bands. [10] Some tunicates live as solitary individuals, but others replicate by budding and become colonies, [11] each unit being known ...
Well-known phyla of invertebrates include arthropods, mollusks, annelids, echinoderms, flatworms, cnidarians, and sponges. The majority of animal species are invertebrates; one estimate puts the figure at 97%. [1] Many invertebrate taxa have a greater number and diversity of species than the entire subphylum of Vertebrata. [2]
We tested more than 25 walking sneakers for flat feet, and consulted with three board-certified podiatrist on the most comfortable sneakers. Favorites include Hoka, On, and Asics.
Phylum Kinetoplastida – Flagellated protists belonging to the phylum Euglenozoa; Alveolata phyla – Superphylum of protists; Phylum Ciliophora – Taxon of protozoans with hair-like organelles called cilia; Phylum Apicomplexa – Phylum of parasitic alveolates; Phylum Dinoflagellata – Aquatic, unicellular protists with two flagella
Pluto's reign. For decades, students learned the phrase "My Very Educated Mother Just Served Us Nine Pizzas" to remember the order of the planets in the solar system: Mercury, Venus, Earth, Mars ...