🐠🐸🐦🐒

#vertebrate #amphibian #mammal #animal kingdom #phylum #chordata #diversity

🐟➡️🐒

#evolution #vertebrate #mammal #animal kingdom #phylum #chordata

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#vertebrate #backbone #notochord #spine #phylum #chordata

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#vertebrate #backbone #spine #mammal #phylum #chordata

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#invertebrate chordate #lancelet #amphioxus #vertebrate #mammal #evolution #phylum #chordata

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#backbone #spinal column #chordata #animal classification