Within the boxes, an answer may be used once, more than once, or not at all) b C

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Within the boxes, an answer may be used once, more than once, or not at all) b Cnidaria l Nematods e Annelids Menbes of this phylun have a picudocoelomic Which of the above represents the pat of the onbryological developnent thst alllows Sormatioe of many orgen sys 2. Members of this group have a brain with nerve cords, have a saclike or branchod gui, and lack cireulasory 3 Members of this phylam have . bnin with nerve cord, a complete gut, and a eirculatory sysion ventral c endodenn that is utually elosed This phylam cossins the mos primitive species of e Trichoples the animal kingdom ie the lst 13. A digestive tract is complese if w a possesses specialized regions for d fleren -EA twe pairs of legs per segmen B. tiny, flatiened, crawling fom C. planarians, flukes, tapewom D nematodes E snails, sqoids clams digestive tasks b produces acids and comaies enrymes e wies the same opening for ingestion and Ail animals are is a one-way tube with a mouth and an nu is surrounded by muscle rgestion S.roundwoms l4 melicelular, heterotrophic, and digloid d. malricellular, autotrophic, and haploid e unicellular, actotrophic, and haploid 7. placoan IS. Which of the folliowing organisms exhibits 4. A feature found only in echinodems is the sea anenone radula sysien d sponge e Trichoplax d nematocys e mandible 6 Unlike many other animals, sposges lack a a digestive tract b. a symmetrical body plan c nerve cells d larvac e all of these EXCEPT larvac lo. A major trend in the evolution of animals includes b the develupnont of types of syinmetry c. variatios in coclonic cavities d the developmont of segments e) all of these 17. Which of the following insulates various intea Sponges have only which ose of the following a symmetry b organs orgens from the stresses of body wall movement and llows organs to move and grow independently of body walt? IL the b. mesoderm d skeleson e appendages a water vascelar sysiem a saclike ut d

Explanation / Answer

7) the answer is b (tiny ,flattened). The Placozoa are basal form of free-living multicellular organism. They are the simplest in structure of multicellular animals.they are a small, flattened, animal around 1 mm .

11) the answer is d (skeleton).sponges mostly have a spicule’s skeleton. Which gives their body shape.

12)the answer is a (ectoderm). THE ECTODERM develop the central nervous system like the brain and spinal cord, the peripheral nervous system and the sensory epithelia of the ear ,eye and nose, the epidermis and appendages like the nails and hair, the mammary glands, the subcutaneous glands, and the enamel of the teeth.

17) the answer is a ( a coelom).

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