130 Study Guide - Final Guide: Cambrian Explosion, Symmetry In Biology, Germ Layer
28 Nov 2016
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Evolution of number of divergent species from a common ancestor, each species becoming adapted to occupy a different ecological niche. The original population grows and increases in numbers and expands in numbers and expands in size into geological zones that have different climates. The populations in each habitat adapt to their respective habitats and become new species. Essential character of poriferans and supports their monophyly. Within the calcarea, this system displays its greatest variety and traditionally is classified as: asconoid, syconoid, sylleibid, and leuconoid. The primary gut that forms during gastrulation in the. Arthropod (arthropoda) developing zygote is known as the archenteron or the digestive tube. It develops into the endoderm and mesoderm of an animal. Any of a phylum of invertebrate animals that have a segmented body and jointed appendages, a usually chitinous exoskeleton molted at intervals, and a dorsal anterior brain connected to a ventral chain of ganglia.
