Key Topics & Teacher Benefits:Phylum Chordata: Details the four defining characteristics (notochord, post-anal tail, pharyngeal gill slits, dorsal hollow nerve cord) and provides examples (Tunicates, Lancets).Evolutionary Theory: Includes the concept of "Ontogeny Recapitulates Evolution" (similarity in embryonic development).The Mammals: Defines the key characteristics of a mammal (Homoeothermic, Mammary Tissue, Hair) and thoroughly discusses the three major groups:Monotremes (Egg-laying)Marsupi