BIOLOGY 3 Lecture Notes - Lecture 1: Body Plan, Marchantiophyta, Overgrazing
Document Summary
Galaxy < 10 bya, solar system 4. 6 bya. Crust ~4. 4 bya 40 km thick, has nitrogen today. Dissolved gases, minerals from rocks, geochemical cycles 1 bya. Relative position- strata, budding planes, super position, original horizontality index species- principle of faunal/ biotic succession. Carbon dating life assemblage (organisms preserved in their natural habitat) vs death assemblage (become fossils at a site away from their actual habitat due to death and then transport to another area) Hox genes- dictate the duties of particular cells for particular purposes, critical for the proper number and placement of embryonic segment structures (such as legs, antennae, and eyes). Development of a mesoderm and the triploblastic body form. Serves as protection (from predation) internal environment control trilobites- extinct ancestors to today"s crustaceans and insects. Nautiloids- mollusks with straight shells that later curled into the ammonites (extinct) and nautilus as we know it today. Prokaryotes (archaea and eubacteria) cs eukaryotes (eukarya)
