17. Groundstone tools. Among groundstone seed-pulverizing tools, the shift from mortars and pestles and rotary grinding slabs to linear-grinding slabs and handstones is thought to result from. Question 17 options: Increased production of tanned leather hides as trade goods. Decreased need for in-bulk seed grinding. Increased production of red ochre as trade goods. A growing need for more-efficient in-bulk seed grinding. Increasing bone damage from rotary grinding