and i hope they'll remain intact for a long time to come. it's a. test with the yield grass reveals how much marine plants can be affected by acidic water. if the ph drops too low the ribbon like seaweed stops producing certain chemicals in its defense system. that leaves it open to animals interested in grazing like this marine ice of odd. communities in the sea are very complex for experts a constant source of wonder skipped it. is there are more than twenty five live animals that only exist in the sea and every phylum has its own body play. and its own evolutionary expression all based on very different principles that's why we see