Craniate with well-defined heads, thus excluding members of the chordate subphyla Tunicata (tunicates) and Cephalochordata (lancelets), but including Myxini, which have cartilaginous skulls and tooth-like structures composed of keratin. Craniata also includes all lampreys and armoured jawless fishes, armoured fish, sharks, skates, and rays, and teleostomians: spiny sharks, bony fish, lissamphibians, temnospondyls and protoreptiles, sauropsids and mammals. The craniate head consists of a brain, sense organs, including eyes, and a skull. In addition to distinct crania (sing. "cranium"), craniates possess many derived characteristics, which have allowed for more complexity to follow. Molecular-genetic analysis of craniates reveals that, compared to less complex
What Have We Learned, Charlie Brown? site of a series of battles during World War I. They arrive at a field of red poppies, which grew throughout the wastelands of battles fought during the war, and which serves as a marker for the Ypres battle site. Linus then recites the poem "In Flanders Fields", after directing the group to the British field dressing station where McCrae was inspired to write the poem. They come away realizing what the impact of the wars were, and how important the sacrifice of the soldiers was. Standing among the field of red poppies, Linus then turns and asks, "What have