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

Question 14

Amphibians lay ______ that do not have hard protective coverings, or __________

Answer 14

eggs, shell

Question 15

Young amphibians live in water and have ____________; most adults develop ____________ and live on land.

Answer 15

gills, lungs

Question 16

Lizards, ____________, turtles, crocodiles and alligators belong to the class ___________

Answer 16

snakes, reptiles

Question 17

All reptiles have _____________ skin that is covered in ____________.

Answer 17

waterproof, scales

Question 18

Like amphibians, most reptiles have three-chambered _________

Answer 18

hearts

Question 19

Unlike amphibians, lizards and other reptiles have ____________ throughout their lives.

Answer 19

lungs

Question 20

Most reptiles lay fluid-filled _______________ with ____________ shells.

Answer 20

eggs, leathery

Question 21

All birds are in the class _________

Answer 21

Aves

Question 22

Many birds can ___________, and they have stiff ________ _________ that enable them to move through the air.

Answer 22

fly, hollow bones

Question 23

Birds have ____________ and do not chew their food; instead, their digestive systems include _________________, which are organs that help grind food into smaller pieces

Answer 23

beaks, gizzards

Question 24

Birds lay fluid-filled ___________ with hard shells and feed and care for their _______________

Answer 24

eggs, young

Question 25

All mammals have hair or _________ covering their bodies

Answer 25

fur

Question 26

_____________ glands produce milk that feeds young mammals

Answer 26

Mammary

Question 27

Although many mammals have _____________ young, a few species, including the duck-billed platypus lay eggs.

Answer 27

live