What is the tectonic cycle? briefly summarize it.

In simple terms, heavier plates get melted in Mantle, become lighter in form of lava and create new plates. As we have a re-cycle or the convection currents, there are cycles in lithosphere.
There is continuous push and pull happening on and below the Earth. When a plate is subducting on one end, there has to be some reaction on the other end, right?
Ridge is developed on the other side, where the same material which has been melted on the subduction side helps to fill the gap at ridge side. Since the material is just transfered from heavy to light, and reused in that cell, it is called a cycle.
Hope this helps Thanks! Merry christmas

Cladistics-This way(method) groups all the descendants from a common radiation into a clade as a related group and no others.Phylogeny- is a way of tracking evolutionary relationships based on shared characters between different species

Explanation:

Cladistics is concerned with entire branchings. This way(method) groups all the descendants from a common radiation into a clade as a related group and no others. The clades are monophyletic.

Cladistics is a narrower definition of an older, less precise concept now days.

Phylogeny is a way of tracking evolutionary relationships based on shared characters between different species.. This method allows convergent characters to be grouped despite their having followed a separate evolutionary path.  

Cladistics is a way (method) of grouping the related branches based on sharing derived characters within the group. However, these characters are not found in any  other species except by convergence.