Question

what do you mean by parabola ?

Answer 1

The parabola is the locus of points in that plane that are equidistant from both the directrix and the focus. Another description of a parabola is as a conic section, created from the intersection of a right circular conical surface and a plane parallel to another plane that is tangential to the conical surface.

Answer 2

In 1846 he named this substance protoplasm, a word that had been invented by the Czech physiologist Jan Evangelista Purkinje with reference to the embryonic material found in eggs. Von Mohl was also first to propose that new cells are formed by cell division, a process he observed in the alga Conferva glomerata.