| Measure | Value |
|---|
Each phylum is described by its typical adult body plan, simplified: sponges are shown without symmetry (a few are radial), echinoderms are scored by their five-part adults (their larvae are bilateral), arthropod body cavities are counted as a reduced coelom, and chordate segmentation (muscle blocks) is accepted either way. The tree is the current DNA-based working hypothesis with some branches collapsed. Animation speed is exaggerated.
| Feature | Protostome | Deuterostome |
|---|
Typical patterns, simplified. Many protostomes (such as snails and annelids) show spiral, determinate cleavage and schizocoely; arthropods and some others differ. Deuterostomes show radial, indeterminate cleavage and enterocoely, though vertebrates form their coelom in a modified way. Hours of development are compressed into seconds.
Problems are randomly generated from simplified keys and trees. Keys work on typical adult features; real keys add many exceptions. Trees are drawn with random rotations, so the order of names on the page changes but the relationships do not.
Your job
Drag a card onto a box, or tap a card and then tap the box's name. Cards are buttons, so Tab and Enter work too.
Teaching data with rounded values, patterned on published studies.
Wrong picks are fine here. Each one tells you why.