<span>The presence of rigid cell wall that gives the block like structure to the plant cells which is not the case with the animal cells which has soft membranes. Another reason for this kind of maintenance of plant cell shape is that the network of fibers that are present in the cytoplasm called as Cytoskeleton.</span>
The condition that is most likely to be present in the region left by the melting glaciers in Alaska is that algae and fungi growing on bare rock. This is because environment in primary succession is essentially deprived of vegetation and several kinds of organisms. Thus, plants are unable to grow since the soil lacks nutrients.
