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If vertebrates and internal bones are so good and cool how come the first radiation of fish just had exoskeletons

18 123
2021-02-12

Also speaking as someone with a good deal of experience with comparative vertebrate anatomy the answer is A, analogous clothes proceed along the body axis. See:

1 6
2021-02-10

I should’ve said that snakes have a “Special adaptation” not “special bone” as other species also have the quadrate. It forms the upper part of the jaw joint. In snakes, this bone is adapted to be a double hinge while in other vertebrates it is fused or a part of the upper skull.

0 0
2021-02-05

45. Most cases of cauda equina result from disc protrusion. The intervertebral discs are a secondary cartilaginous joint. They have a tough outer layer and a gelatinous core. Cartilaginous end plate of each disc attaches to the bony endplate of vertebrae.

0 8
2021-02-05

My own little take on the Skullcrawler.

I reimagined it as a gigantic amphibious invertebrate sea monster, like C-Rex from the ‘98 animated Godzilla series.

May or may not use this in a future Godzilla-related fan project...

3 14
2021-01-31

thanks to early Spanish colonists in the 1500s, we know of Aztec, Inca, and other ancient oral traditions about discoveries & interpretations of large vertebrate fossils
How to this?
Drawn by Ed Heck colored by Michele Angel for of the First Americans

3 16
2021-01-30

Decorating the office with graphic illustrations was a fun project to do.
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Swipe left 👈 to see detailed illustration and mockup
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0 0
2021-01-26

can't stop this invertebrate on a mission 🧽 ⚓️

1 30
2021-01-26

fish1
/fiSH/ Noun
a limbless cold-blooded vertebrate animal with gills and fins and living wholly in water.

3 13
2021-01-24

my emotional support invertebrates

0 11
2021-01-23