Science DJ 7th grade

Question 1

A (n) ___________ is an animal that has a notochord, a nerve cord, a tail, and structures called pharyngeal pouches.

Answer 1

chordate

Question 2

A(n) _______________ is a flexible, rod-shaped structure that supports the body of a developing chordate.

Answer 2

notochord

Question 3

Most chordates are ___________, but the chordates also include two groups of __________ tunicates and lancelets.

Answer 3

vertebrates, invertebrates

Question 4

All vertebrates have a(n) ______________, also called a spinal column or spine.

Answer 4

backbone

Question 5

Bones that form a backbone are called ____________

Answer 5

vertebrae

Question 6

All vertebrates have digestive systems with two ____________, circulatory systems that move ___________ through the body, and nervous systems that include _____________.

Answer 6

openings, blood, brains

Question 7

Fish have two important characteristics in common, ________ that absorb oxygen gas from water and paired _________ that aid in swimming

Answer 7

gills, fins

Question 8

Hagfish and lampreys lack ____________ and are in a group called _____________ fish.

Answer 8

jaws, jawless

Question 9

Sharks, skates, and rays are ____________ fish

Answer 9

cartilagenous

Question 10

Jawless and carilaginous fish have internal structures made of

Answer 10

cartilage

Question 11

Trout, guppies, perch, tuna, mackerel, and thousands of other species have _______________ and are grouped together as _________ fish.

Answer 11

bones, bony

Question 12

Frogs, toads, and salamanders belong to the class ___________

Answer 12

Amphibia

Question 13

Most amphibians spend part of their lives in _________ and part on _____________

Answer 13

water, land