In two separate boating incidents, one as a teenager on the Mississippi River and one on the Great Lakes, President Lincoln got his boats stuck in shallow waters, known as shoals.. These two experiences inspired Lincoln to invent a solution to help him navigate his boat through shallow waters.
Algae are simple plants. The biggest similarity with more  'regular' lants is that they both contain chlorophyll    Green algae and plants are sister taxon, that is, tâ¦hey share a  common ancestor.    For this reason, they both have double membrane bound plastids that  contain chlorophyll a and b.
All brown algae are multicellular. Although some of the larger species such as the giant kelps appear to have stems and leaves, they are not true stems and leaves such as those found in the vascular plants, because they do not contain true vascular tissue.