Abundant evidence supports the major contentions of the seafloor-spreading theory. First, samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached, and the sediment cover is thinner near the ridge.
We need carrier proteins for steroid hormones because they help in the transportation from the cell they were released from to their target cell. let me know if you have any further questions :)
