Which organism was most likely to live at the same time as brachiopods?

trilobites

placoderms

ammonites

gastropods

Gastropods should be around the same period

The correct answer to this question is this one: gastropods. The organism that was most likely to live at the same time as brachiopods are called the gastropods. It also known as snails and slugs, are a large taxonomic class within the phylum Mollusca. The class Gastropoda includes snails and slugs of all kinds and all sizes from microscopic to large.