Definition of a Tangent Plane We all have and intuitive idea of what the tangent plane to a point on a given surface should be. It is the plane that goes through that point and that it is tangent to the surface at that point. Suppose. z = f(x,y) is a smooth surface above the xy-plane (see the picture below).
The two prokaryotic domains (or empires),  Bacteria  (or  Eubacteria ) and  Archaea  (or  Archaeobacteria ), are subdivided into 35 phyla (or divisions): 30 phyla in the domain  Bacteria , and 5 phyla in the domain  Archaea .
A phylum is the taxonomical rank below kingdom and above class. The kingdom Animalia contains approximately 40 phyla. Organisms are grouped into phyla based on a general body â¦ plan.For example, the phylum Chordata contains all those animals with a spinal cord. phylum is a group of animals that are directly drawn from a kingdom. A sub-phylum is a phylum that is slightly more accurate for a group of animals but is not a class.