Which body part represents the notochord in vertebrates

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent

Which direction does the energy flow in this energy pyramid ?

Me. henley said, “in the rat race we call life, only the strong will survive.” he may have been referring to