Chapter 9- Introduction to Animals

Question 0

adaptations

Answer 0

structures and behaviors that allow animals to perform their functions

Question 1

homeostasis

Answer 1

The condition in which an organism’s internal environment is kept stable in spite of changes in the external environment.

Question 2

vertebrate

Answer 2

an animal with a backbone

Question 3

invertebrate

Answer 3

an animal without a backbone

Question 4

tissue

Answer 4

group of similar cells that perform a specific function

Question 5

organ

Answer 5

made up of tissue

Question 6

radial symmetry

Answer 6

body plan in which any number of imaginary lines that all pass through a central point divide the animal into two mirror images

Question 7

bilateral symmetry

Answer 7

body plan in which a single imaginary line divides the body into left and right sides that are mirror images of each other

Question 8

cnidarian

Answer 8

invertebrate that uses stinging cells to capture food and defend itself
ex. jellyfish, coral

Question 9

mollusk

Answer 9

invertebrate with a soft body with a hard shell that protects the body

Question 10

arthropod

Answer 10

invertebrate that has an external skeleton, a segmented body, and jointed appendages

Question 11

exoskeleton

Answer 11

outer skeleton

Question 12

chordate

Answer 12

animal that has a nerve cord, a notochord, and throat pouches at some point in its life

Question 13

notochord

Answer 13

flexible rod that supports a chordate’s back just below the nerve cord

Question 14

vertebrae

Answer 14

bones that make up the backbone of an organism

Question 15

ectotherm

Answer 15

animal whose body temperature is determined by the temperature of its environment

Question 16

endotherm

Answer 16

animal whose body temperature is regulated by the internal heat the animal produces

Question 17

fish

Answer 17

vertebrate that lives under water, and use fins to move

Question 18

cartilage

Answer 18

tissue more flexible than bones

Question 19

amphibian

Answer 19

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

Question 20

reptile

Answer 20

ectothermic vertebrate that has scaly skin and lungs, and lay eggs on land

Question 21

bird

Answer 21

ectothermic vertebrate that lays eggs and has feathers and a four-chambered heart

Question 22

mammals

Answer 22

endothermic vertebrate that have skin covered with fur or hair, and a four-chambered heart

Question 23

mammary glands

Answer 23

organs that produce milk to feed the young

Question 24

monotremes

Answer 24

a mammal group that lay eggs

Question 25

marsupials

Answer 25

a mammal group that a born at an early stage of development, mother eventually develops a pouch

Question 26

placental mammal

Answer 26

a mammal that develops inside its mother’s body until its body systems can function independently

Question 27

placenta

Answer 27

materials exchanged between mother and embryo through an organ