Reconstructing trees: Cladistics. Cladistics is a method of hypothesizing relationships among organisms  in other words, a method of reconstructing evolutionary trees. The basis of a cladistic analysis is data on the characters, or traits, of the organisms in which we are interested.ladistics is a method of hypothesizing relationships among organisms  in other words, a method of reconstructing evolutionary trees.
Adenosine triphosphate (ATP) (shown in Figure 1) is the main molecule used for energy transfers and transport within cells. It is also one of the monomers used in the synthesis of RNA and, after it is converted to deoxyATP (dATP), in the synthesis of DNA.
Energy System 1: Ready fuel for immediate energy. The Immediate Energy system, or ATP-PC, is the system the body uses to generate immediate energy. The energy source, phosphocreatine (PC), is stored within the tissues of the body.When exercise is done and energy is expended, PC is used to replenish ATP.Basically, the PC functions like a reserve to help rebuild ATP in an almost instantaneous manner.he bulk of the ATP produced by the human body comes from the mitochondria. Therefore, the bulk of the ATP produced is via âaerobicâ processes. The first two energy systems are anaerobic, meaning they do not require oxygen.