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Chapter 30 The Chordates

Across
Modified male fins used to transfer sperm into females body
Plate-like scales on sharks
Cartilaginous fish
Fin on the sides of the fishes head, used to slow or stop the fish
Row of sensory pores that detects vibrations in the water.
Primitive fish, thought to use fin-like appendages to crawl up on land.
Fin that pushing fish forward
Can become the back bone
Chord that runs along the dorsal side, has nerves, branches out and can become the spinal cord.
Projections in the intestines
Filter feeder found in tide pools
Attached to the gills, prevents food particles from passing into bronchial clefts.
Structure that allows more oxygen to diffuse into the blood
Boney fish
Organ used for gas exchange
Down
Organ that produces bile
Small fish like creature found on sand ocean floors
Throat area, may develop into gills
Fin on the top of fish, used for defense
Organ that sores bile
Jawless fish
Internal skeleton
Fin below the tail
Disk-shaped mouth used to scrapes holes in flesh
Brain region, that intercepts smell
Organ that removes excess sodium and chloride ions from blood
Gill covering on boney fish
Organ that release pancreatic enzymes
Can be used to determine the age of a fish
Fin used as a navigator