Eukaryotes are multicellular organisms that contain diverse differentiated cell types. Within almost every cell there are subcellular compartments called...
Covering a flat surface with some pattern of geometric shapes with no overlaps or gaps is called tiling. Tiling shows up in many places, from the tiles...
Natural stone arches are commonly made of sandstone or limestone and are found in coastal cliff areas that can be eroded by wave action. Other arches...