Question

1- This flexible rod like structure found in all chordate embryos is replaced by the vertebral column in most vertebrates.
Group of answer choices

notochord

dorsal, hollow nerve cord

pharyngeal clefts

post anal tail

2- This embryonic chordate structure develops into the brain and spinal cord in most Chordates.
Group of answer choices

dorsal, hollow nerve cord

notochord

pharyngeal clefts

post anal tail

3- The embryonic structure develops into gills in some chordates.
Group of answer choices

pharyngeal clefts

post anal tail

notochord

dorsal, hollow nerve cord

4- This unique chordate structure likely evolved for swimming and persists in many adult chordates but is a vestigial structure in our primate lineage.
Group of answer choices

post anal tail

pharyngeal clefts

notochord

dorsal, hollow nerve cord

5- In this filter feeding worm-like nonvertebrate chordate, the four unique embryonic structures persist into adulthood.
Group of answer choices

lancelet

tunicate

lamprey

hagfish

6- In this suspension feeding nonvertebrate chordate, the tail, notochord and the dorsal, hollow nerve cord all cease to exist in the adult animal.
Group of answer choices

tunicate

lancelet

lamprey

hagfish

7- These vertebrate fishes do not have a jaw.
Group of answer choices

lamprey and hagfish

sharks and rays

lungfishes

lancelet and tunicate

8- These jawed fishes endoskeleton is made entirely of cartilage.
Group of answer choices

sharks, rays, skates and ratfish

lamprey and hagfish

coelocanth and lungfish

goldfish and salmon

9- What two unique features do all (and only)mammals share?
Group of answer choices

hair and mammary glands

teeth and four chambered heart

endothermic and closed circulatory system

vertebrae and thoracic breathing

10- These aquatic filter feeding animals lack true tissues and organ systems.
Group of answer choices

sponges

jellies

sea stars

polycheate worms

11- These radially symmetrical aquatic animals have a specialized cell used for defense and prey capture that is unique to these animals.
Group of answer choices

jellies, hydra, coral and sea anemones

sponges

polycheate worms

crustaceans

12- These animals have little hair-like bristles that assist them in digging and anchoring and parapodia appendages on most of their segment which are used for crawling, swimming and anchoring.
Group of answer choices

polychaete worms

roundworms

flatworms

sea cucumbers

Answer 1

1) The correct option is A . notochord.

notochord is present in all the chordates whereas in vertebrates the notochord is replaced by vertebral column during embryonic stage.

2) The correct option is A. Dorsal hollow nerve chord.

the dorsal hollow nerve chord that develops into brain and spinal chord in most chordates.

3) The correct option is A. pharyngeal clefts.

4) the correct option is post anal tail.

post anal tail in many aquatic chordates like sharks used to swim in water whereas in primates like humans and monkeys it is vestigial .