Zoology Questions
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When an animal's body is divided into a number of nearly identical units or regions, it has a(n) ___ body plan.
Which phyla contain members that undergo ecdysis?
Genes involved in pattern formation of the body and appendages in early embryos are
Which of the following describes one phylum of animals?-parazoa-protostomes-radiate-bilateriaeumetazoa
Favorable environments, the appearance of the Hox gene, and new methods of predator avoidance are hypothesized reasons for:
What type of cleavage pattern results in layers of cells that are lined up directly above one another?
Insects, spiders, crustaceans, and nematodes belong to what?
The Lophotrochozoa are unified by two morphological characteristics, the presence of a feeding structure called the ____ and the presence of a free-living larval stage known as a(n) _____
Animals that are triploblastic, have a dorsal and a ventral side, have an anterior and posterior end, and exhibit cephalization belong to the group _______
All of the following are characteristics common to most animals except: -anchoring tight and gap junctions-multicellularity-heterotrophs-cell walls-movement
Could have contributed to the Cambrian explosion EXCEPT:a) High oxygen levels due to the arrival of land plantsb) evolutionary arms race between predator and preyc) the evolution of the HOX gene complexd)the warm and wet environment with no ice at the polese) the development of the ozone layer
Animals are traditionally classified by differences in their:
Animals that undergo embryonic development where the embryonic blastopore develops to become the animal's mouth are _____
What morphological features have traditionally been used to classify animals, but are now recognized as being less useful in determining evolutionary relationships than originally thought?
Which of the following is the most likely ancestor form which animals evolved?(Colonial/Solitary)flagellated(bacterium/protist)
The two major groups of animals that are defined based on their body symmetry are ____ and ____
Consist of a singly phylum, porifera(sponges)
Radial animals have two embryonic layers called ____
Following the formation of a zygote, the process of germ layer formation proceeds such that rapid mitotic cell divisions lead to the development of a(n) _____, followed by its inward folding, allowing different layers of cells to develop in the _________.
Because of their lack of specialized tissues and organs, _____ are often considered to be the simplest animals.