BIO153H5 Study Guide - Comprehensive Final Exam Guide - Evolution, Phylogenetic Tree, Dna
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Having tissues that develop from embryonic layers. Animals can be characterized by a body plan. Acoeolomate: no body cavity (every part of the body is tissues. Pseudo(cid:272)oelo(cid:373)ate: has so(cid:373)e (cid:271)ody (cid:272)a(cid:448)ity, (cid:271)ut does(cid:374)"t see(cid:373) to (cid:271)e proper. A coelom is a body cavity completely lined with mesoderm. We also have molecular information to construct a phylgenetic tree for animals. Molecular data divides protozoans into lophotropozoa (larvae stage) and ecdysozoa (shedding) The relationships between taxa in the two trees are different. Eumetazoa is a clade of animals with true tissues. Most animal phyla belong to the clade bilateria. Chordates and some other phyla belong to the clade. What does this say about science: most scientific ideas need to be argued about, data can be interpreted differently by different scientists. Science always keeps an open mind, since all hypotheses have the potential to be falsified. It"s a(cid:374) i(cid:374)trodu(cid:272)tio(cid:374); it does(cid:374)"t i(cid:374)(cid:272)lude the i(cid:374)-depth findings about the scientific debate of these phylogenetic relationships.
