Book 2, Chap 4

Question 1

Homeostasis

Answer 1

Keeping internal body conditions stable.

Question 2

Adaptations

Answer 2

Structures and behaviors that allow animals to perform their functions.

Question 3

Vertebrates

Answer 3

Animals with a backbone.

Question 4

Invertebrates

Answer 4

Animals without a backbone.

Question 5

Tissue

Answer 5

A group of similar cells that performs a specific function.

Question 6

Organ

Answer 6

Mad up of different tissues.

Question 7

Radial symmetry

Answer 7

Imaginary lines.

Question 8

Bilateral symmetry

Answer 8

Line a symmetry.

Question 9

Cnidarian

Answer 9

Invertebrates that have stinging cells and take food into a central body cavity.

Question 10

Mollusk

Answer 10

Invertebrates with soft, unsegmented bodies that are often protected by a hard shell.

Question 11

Arthropod

Answer 11

Invertebrates that have hard putter coverings, segmented bodies, and Paris of jointed appendages.

Question 12

Exoskeleton

Answer 12

Outer skeleton.

Question 13

Echinoderm

Answer 13

Invertebrates that has an internal skeleton and a system of fluid-filled-tubes.

Question 14

Endoskeleton

Answer 14

An internal skeleton.

Question 15

Chordate

Answer 15

Have three characteristics: a notochord, a nerve chord, and pouches in the throat area.

Question 16

notochord

Answer 16

A flexible rod that supports a chordate’s back.

Question 17

Vertebrae

Answer 17

A stack of many small bones.

Question 18

Ectotherm

Answer 18

An animal that produces little internal body heat.

Question 19

Endotherm

Answer 19

An animal that controls the internal heat it produces and regulates its own temperature.

Question 20

Fish

Answer 20

A vertebrate that lives in water and uses fins to move.

Question 21

Cartilage

Answer 21

A tissue more flexible then a bone.

Question 22

Amphibian

Answer 22

A vertebrate that is ectothermic and spends its early life in water and its adult life on land

Question 23

Reptile

Answer 23

An ectothermic vertebrate that has scaly skin and lungs and lays eggs on land.

Question 24

Bird

Answer 24

An endothermic vertebrate that lays eggs and has feathers and a four-chambered heart.

Question 25

Mammals

Answer 25

Endothermic vertebrates that have skin covered with fur or hair, and a four-chambered heart.

Question 26

Mammary glands

Answer 26

Milk produced by organs.

Question 27

Monotremes

Answer 27

Lay eggs.

Question 28

Marsupials

Answer 28

Born at an early stage of development, and they usually continue to develop in a pouch on the mother’s body.

Question 29

Placental mammal

Answer 29

Develops inside its mother’s body until its body systems can function independently.

Question 30

Placenta

Answer 30

An organ where materials are exchanged between mother and the embryo.