University of Idaho Biology 114 Final Exam Review Questions With 100% Correct Answers!!

The last common ancestor of all animals was probably a ____. a. unicellular chytrid b. unicellular yeast c. multicellular algae d. multicellular fungus e. flagellated protist - Answer-d. multicellular fungus What synapamorphy distinguishes animals as a monophyletic group, distinct from choanoflagellates? a. sexual reproduction b. heterotrophy c. multicellularity d. no cell walls - Answer-c. multicellularity The evolution of animal species has been prolific. Much of this diversity is a result of the evolution of novel ways to ____. a. arrange cells into tissues b. form an embryo and establish a basic body plan c. sense, feed, and move d. become terrestrial - Answer-c. sense, feed, and move The most ancient branching point in animal phylogeny is the characteristic of having ___. a. radial or bilateral symmetry b. diploblastic or triploblastic embryos c. true tissues or no tissues d. a body cavity or no body cavity - Answer-c. true tissues or no tissues What was an early selective advantage of a coelom in animals? A coelom ___. a. was a more efficient digestive systemb. allowed asexual and sexual reproduction c. allowed cephalization and the formation of a cerebral ganglion d. contributed to a hydrostatic skeleton, allowing greater range of motion - Answer-d. contributed to a hydrostatic skeleton, allowing greater range of motion An adult animal that possesses bilateral symmetry would most likely also be ____. a. a deuterstome b. coelomate c. diploblastic d. triploblastic - Answer-d. triploblastic