Compare and contrast cladistics and phylogeny. What are their advantages and disadvantages? Which is the most useful in understanding how an organism developed into its current form? Which concept most strongly supports your opinion about the origin of any given organism?

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.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.