invertebrates

Question 1

an animal of a large group distinguished by the possession of a backbone or spinal column.

Answer 1

vertebrates

Question 2

an animal that does not have a backbone

Answer 2

invertebrates

Question 3

a person or something that eats something

Answer 3

consumer

Question 4

a mass of nerve cells

Answer 4

ganglion

Question 5

the digestive tract

Answer 5

gut

Question 6

a body cavity that contains the internal organs

Answer 6

coelom

Question 7

arrangement of an organism or part of an organism along a central axis, so that the organism or part can be divided into two equal halves.

Answer 7

bilateral symmetry

Question 8

arrangement of parts of an organism around a single main axis, so that the organism can be divided into similar halves by any plane that contains the main axis.

Answer 8

radial symmetry

Question 9

lack of equality or equivalence between parts or aspects of something; lack of symmetry.

Answer 9

asymmetry

Question 10

a primitive sedentary aquatic invertebrate with a soft porous body that is typically supported by a framework of fibers or calcareous or glassy spicules.

Answer 10

sponge

Question 11

an aquatic invertebrate animal of the phylum Cnidaria, which comprises the coelenterates

Answer 11

cnidarians

Question 12

a phylum that includes the planarians together with the parasitic flukes and tapeworms. They are distinguished by having a simple flattened body

Answer 12

flatworm

Question 13

a nematode, especially a parasitic one found in the intestines of mammals.

Answer 13

roundworm

Question 14

an invertebrate of a large phylum that includes snails, slugs, mussels, and octopuses.

Answer 14

mollusks

Question 15

pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells.

Answer 15

open circulatory system

Question 16

all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities.

Answer 16

closed circulatory system

Question 17

also known as the ringed worms or segmented worms, are a large phylum

Answer 17

annelid worms

Question 18

a portion cut off from a geometric figure by one or more points, lines, or planes: asa

Answer 18

segment

Question 19

a rigid external covering for the body in some invertebrate animals, especially arthropods, providing both support and protection.

Answer 19

exoskeleton

Question 20

an eye consisting of an array of numerous small visual units, as found in insects and crustaceans.

Answer 20

compound eye

Question 21

a conductor by which electromagnetic waves are sent out or received

Answer 21

antenna

Question 22

includes, in insects, the transformation of a maggot into an adult fly and a caterpillar into a butterfly and, in amphibians, the changing of a tadpole into a frog.

Answer 22

metamorphosis

Question 23

an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.

Answer 23

endoskeleton

Question 24

a network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels.

Answer 24

water vascular system