BSC 2011: Exam 3 Test Questions and
All Correct Answers 2026-2027 Updated.
Cambrian Explosion - Answer 530 mya; Most animal phyla around today appeared then
Metazoa - Answer all animals tissue
Parazoa - Answer no specialized tissues or organs
Eumetazoa - Answer more than one type of tissue and organs
Radiata - Answer radially symmetrical; dorsal and ventral ends; 3 germ layers
bilateria - Answer bilaterally symmetrical;oral and aboral sides; 2 germ layers
triploblastic - Answer 3 layers of cells
diploblastic - Answer 2 layers of cells
endoderm - Answer inner layer of cells
ectoderm - Answer outer layer of cells
mesoderm - Answer 3rd layer in bilateral animals; formas muscles and most other organs
true coelom - Answer body cavity is completely lined with mesoderm (coelomates)
pseudocoelom - Answer coelom is not completely lined by tissue derived from mesoderm
(pseudocoelomates)
Acoelomates - Answer lacks a body cavity entirely
protostome - Answer spiral cleavage; cleavage determinate; blastopore becomes mouth
deuterostome - Answer radial cleavage; cleavage is indeterminate; blastopore becomes anus
, sessile polyp - Answer tubular body with tentacles surrounding the opening
motile medusa - Answer umbrella-shaped with a mouth on the underside surrounded by
tentacles
cnidocil - Answer hairlike trigger
acoelomate - Answer lacking fluid-filled cavity
turbellaria - Answer free-living platyhelminthes
cestoda - Answer tapeworms
trematoda - Answer flukes
radula - Answer unique tongue-like organ found in mollusca
gastropods - Answer snails, slugs, nudibranchs
bivalves - Answer clams, mussels, oysters
cephalopods - Answer octopuses, squids, nautiluses
double transport system - Answer circulatory system and coelomic fluid carries nutrients,
wastes, and respiratory gases
polychaeta - Answer marine worms
clittelata - Answer with subclasses oligochaeta and hirudinea
oligochaeta - Answer terrestrial and freshwater worms (earthworms)
hirudinea - Answer leeches
All Correct Answers 2026-2027 Updated.
Cambrian Explosion - Answer 530 mya; Most animal phyla around today appeared then
Metazoa - Answer all animals tissue
Parazoa - Answer no specialized tissues or organs
Eumetazoa - Answer more than one type of tissue and organs
Radiata - Answer radially symmetrical; dorsal and ventral ends; 3 germ layers
bilateria - Answer bilaterally symmetrical;oral and aboral sides; 2 germ layers
triploblastic - Answer 3 layers of cells
diploblastic - Answer 2 layers of cells
endoderm - Answer inner layer of cells
ectoderm - Answer outer layer of cells
mesoderm - Answer 3rd layer in bilateral animals; formas muscles and most other organs
true coelom - Answer body cavity is completely lined with mesoderm (coelomates)
pseudocoelom - Answer coelom is not completely lined by tissue derived from mesoderm
(pseudocoelomates)
Acoelomates - Answer lacks a body cavity entirely
protostome - Answer spiral cleavage; cleavage determinate; blastopore becomes mouth
deuterostome - Answer radial cleavage; cleavage is indeterminate; blastopore becomes anus
, sessile polyp - Answer tubular body with tentacles surrounding the opening
motile medusa - Answer umbrella-shaped with a mouth on the underside surrounded by
tentacles
cnidocil - Answer hairlike trigger
acoelomate - Answer lacking fluid-filled cavity
turbellaria - Answer free-living platyhelminthes
cestoda - Answer tapeworms
trematoda - Answer flukes
radula - Answer unique tongue-like organ found in mollusca
gastropods - Answer snails, slugs, nudibranchs
bivalves - Answer clams, mussels, oysters
cephalopods - Answer octopuses, squids, nautiluses
double transport system - Answer circulatory system and coelomic fluid carries nutrients,
wastes, and respiratory gases
polychaeta - Answer marine worms
clittelata - Answer with subclasses oligochaeta and hirudinea
oligochaeta - Answer terrestrial and freshwater worms (earthworms)
hirudinea - Answer leeches
