21- What is the type of body cavity where the organs are surrounded by tissue layers...

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Biology

21- What is the type of body cavity where the organs aresurrounded by tissue layers which suspend and protect the internalorgans?
Group of answer choices
Coelom
Pseudocoelom
Acoelomate
22- These animals were the first to make it onto land~460 million years ago.
Group of answer choices
Arthropods
Flatworms
Roundworms
Molluscs
23- This flexible rod like structure found in allchordate embryos is replaced by the vertebral column in mostvertebrates.
Group of answer choices
notochord
dorsal, hollow nerve cord
pharyngeal clefts
post anal tail
24- This embryonic chordate structure develops into thebrain and spinal cord in most Chordates.
Group of answer choices
dorsal, hollow nerve cord
notochord
pharyngeal clefts
post anal tail
25- The embryonic structure develops into gills in somechordates.
Group of answer choices
pharyngeal clefts
post anal tail
notochord
dorsal, hollow nerve cord
26- This unique chordate structure likely evolved forswimming and persists in many adult chordates but is a vestigialstructure in our primate lineage.
Group of answer choices
post anal tail
pharyngeal clefts
notochord
dorsal, hollow nerve cord
27- In this filter feeding worm-like nonvertebratechordate, the four unique embryonic structures persist intoadulthood.
Group of answer choices
lancelet
tunicate
lamprey
hagfish
28- In this suspension feeding nonvertebrate chordate,the tail, notochord and the dorsal, hollow nerve cord all cease toexist in the adult animal.
Group of answer choices
tunicate
lancelet
lamprey
hagfish
29- What two unique features do all (and only)mammalsshare?
Group of answer choices
hair and mammary glands
teeth and four chambered heart
endothermic and closed circulatory system
vertebrae and thoracic breathing
30- These aquatic filter feeding animals lack truetissues and organ systems.
Group of answer choices
sponges
jellies
sea stars
polycheate worms

Answer & Explanation Solved by verified expert

3.8 Ratings (447 Votes)

21coelom A coelom is a hollow fluidfilled cavity found in many living things where it acts as a protective cushion for their internal organs In some animals such as worms the coelomacts as a skeleton The coelom also allows the internal organs to move and grow independently of the outer layer of the body wall 22 Arthropoda The first fossil arthropods appear in the Cambrian Period 542 million to See Answer

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