Question

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how do blastoids differ from crinoids?

Explanation:

Blastoids and crinoids are both echinoderms. Blastoids had a more box - like theca (body) and a shorter stem, while crinoids have a more cup - shaped calyx and a long, flexible stem. Blastoids also had a unique water vascular system structure and a different mode of attachment in some cases.

Answer:

Blastoids generally had a more box - shaped theca, shorter stems, and different water vascular system and attachment features compared to crinoids.