" How does the circle work?
RHD2 takes calcium from the soil, which makes hairs grow, and produce RHD2 and take more calcium
Roots take RHD2 and calcium from the soil and produce RHD2
Roots make hairs grow, and produce RHD2, and take more calcium
RHD2 takes protein, which makes hairs grow, and produce RHD2, and take more calcium