chapter 41

Question 1

vertebrates are

Answer 1

chordates

Question 2

vertebrates have what 3 characteristics

Answer 2

vertebrae
cranium
endoskeleton

Question 3

class of jawless fishes

Answer 3

agnatha

Question 4

class of sharks and rays

Answer 4

chondrichthyes

Question 5

class of bony fishes

Answer 5

osteichthyes

Question 6

oldest known vertebrates are

Answer 6

jawless fishes

Question 7

fishes have __________ bodies and most have___________

Answer 7

streamlined

paired fins

Question 8

fishes float by means of a _______ or ______ in the body

Answer 8

swim bladder

lipids

Question 9

fishes use ___________ for respiration in the water.

Answer 9

gills

Question 10

the _________ and_________ help fishes maintain homeostasis

Answer 10

kidney and gills

Question 11

modern jawless fishes lack ___________ and ____

Answer 11

paired fins

jaws

Question 12

lampreys are _________

Answer 12

external parasites

Question 13

hagrishes feed on ___________ or on ______ or _________ fishes

Answer 13

invertebrates
dead
dying

Question 14

sharks can ________, _____________ , and ________ _______ to detect prey

Answer 14

smell
see
detect

Question 15

___________ and _______ are flattened bottom dwellers

Answer 15

rays

skates

Question 16

characteristics of bony fishes are ______ on the body, ________ or a ______, and ________ in the skeleton

Answer 16

scales
lungs
swim bladder
bone

Question 17

fishes use their fins for _________,________, and _______

Answer 17

propulsion
maneuvering
stability

Question 18

the digestive system of a fish consists of a _______,________,_____,_____,_______,______,_____,_____,and _____

Answer 18

mouth
pharynx
esophagus
stomach
intestine
liver
gallbladder
panceras
anus

Question 19

the fish heart has what

Answer 19

sinus venosus, atrium, ventricle, and conus arteriosus

Question 20

fertilization is _________in most bony fishes and _____ in some species

Answer 20

external

internal