While the number of cells in plants and animals varies from species to species, humans contain more than 10 trillion (10 13) cells. Most plant and animal cells are visible only under a microscope, with dimensions between 1 and 100 micrometres.
Owner of Jones Mineral Cabinet, Geology and Paleontology Supervisor, interested in Earth and Planetary sciences. Anthracite is a metamorphic rock commonly called coal ,whose protolith or parent rock is bituminous coal.ituminous coal is a sedimentary rock. Anthracite coal is considered a metamorphic rock. 5 people found this useful. Edit. Share to: 1  The Periodic Table of Elements Life is sustained by a number of chemical elements.
Refer to Metamorphic Rock Photos for more visual examples of each of these metamorphic rock types. Foliated (Layered) Metamorphic Rocks 1. slate Slate is metamorphosed shale. Slate is tougher than shale and it breaks into thin, flat layers. Slate is usually dark gray, but it can also be red colored.