These three layers, the endoderm, the ectoderm and the mesoderm, are called the primary germ layers. After gastrulation, the cup-like embryonic stage that contains at least two distinct germ layers is called the gastrula.n mammals, gastrulation is achieved in a very different way. This is because the outer layer of the mammalian blastocyst, which is roughly equivalent to the blastula, becomes the mammalian placenta and is not available to create the primary germ layers of the embryo.
I think the Wolfram System is the term now used to describe what we currently think of as Mathematica. The term Wolfram Language is the language in which you write code in the Wolfram System, or what we currently call (loosely) the Mathematica language, rather than the whole shebang - FrontEnd, Kernel, etc.. Still, that's just me guessing - I know nothing. :) â cormullion Nov 26 '13 at 20:18.
Working with Cells. Wolfram System notebooks consist of sequences of cells. The hierarchy of cells serves as a structure for organizing the information in a notebook, as well as specifying the overall look of the notebook. Font, color, spacing, and other properties of the appearance of cells are controlled using stylesheets. The various kinds of cells associated with a notebook's stylesheet are listed in. The Wolfram System comes with a collection of color and black-and-white stylesheets, which are listed in the menu.