invertebrate Animals vocab

Question 1

embryo

Answer 1

a plant or animal at an early stage of development.

Question 2

consumer

Answer 2

an organism that eats other organisms or organic matter.

Question 3

innate behavior

Answer 3

an inherited behavior that does not depend on the environment or experience.

Question 4

learned behavior

Answer 4

a behavior that has been learned from experience.

Question 5

territory

Answer 5

an area that is occupied by one animal or a group of animals that do not allow other members of the species to enter.

Question 6

hibernation

Answer 6

a period of inactivity and lowered body temperature that some animals undergo in winter as a protection against cold weather and lack of food.

Question 7

estivation

Answer 7

a period of inactivity and lowered body temperature that some animals undergo in summer as a protection against hot weather and lack of food.

Question 8

circadian rhythm

Answer 8

a biological daily cycle

Question 9

social behavior

Answer 9

the interaction between animals of the same species

Question 10

communication

Answer 10

a transfer of a signal or message from one animal to another that results in some type of response

Question 11

pheromone

Answer 11

a substance that is released by the body that causes another individual of the same species to react in a predictable way

Question 12

invertebrate

Answer 12

an animal that does not have a back bone

Question 13

ganglion

Answer 13

a mass of nerve cells

Question 14

gut

Answer 14

the digestive track

Question 15

coelom

Answer 15

a body cavity that contains the internal organs

Question 16

open circulatory system

Answer 16

a circulatory system in which the circulatory fluid is not contained entirely within vessels

Question 17

closed circulatory system

Answer 17

a circulatory system in which the heart circulates blood through a network of blood vessels that form a closed loop

Question 18

segment

Answer 18

any part of a larger structure, such as the body of a organism, that is set off by natural or arbitrary boundaries

Question 19

exoskeleton

Answer 19

a hard, external, supporting structure

Question 20

compound eye

Answer 20

an eye composed of any light detectors

Question 21

antenna

Answer 21

a feeler that is on the head of an invertebrate, such as a crustacean or an insect, that senses touch, taste, or smell

Question 22

metamorphosis

Answer 22

a phase in the life cycle of many animals during which a rapid change from the immature form of an organism to the adult form takes place

Question 23

endoskeleton

Answer 23

an internal skeleton made of bone or cartilage

Question 24

water vascular system

Answer 24

a system of canals filled with a watery fluid that circulates throughout the body of an echinoderm