distribution occur when different organisms able to withstand
different degrees of stress are found living in areas along the
shore that suit their particular needs. The upper limit of an
organism's distribution on the shore depends largely on its
degree of tolerance of the physical environment. However, the
lower limits of distributions are usually affected by
interactions with other animals and plants such as competition
and predation. two extremes, many habitat features are important
determinants of the distribution patterns of intertidal plants
and animals.