The large, round object in the center of this view is a diatom.
Diatoms are protists that grow a silica shell around themselves.
When diatoms divide, each offspring takes half of the original shell with it, and grows another matching half to complement the inherited shell portion. Diatoms are frequently found in wet environments, such as ponds. They also grow on most soil. Diatoms grow on the surface layer of soil, where they can use sunlight to produce food via photosynthesis. This species of diatom is yellow-brown in color when viewed with visible light.