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Chapter 15
Invertebrates
An animal without a backbone
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Invertebrate
An animal without a backbone
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A body plan in which two halves of an
organism’s body are mirror images of
each other
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Bilateral symmetry
A body plan in which two halves of an
organism’s body are mirror images of
each other
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A body plan in which the parts of a
body are arranged in a circle around
a central point
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Radial symmetry
A body plan in which the parts of a body
are arranged in a circle around a
central point
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Without symmetry
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Asymmetrical
Without symmetry
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Group of nerve cells
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Ganglia
Group of nerve cells
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The pouch where food is digested in
animals
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Gut
The pouch where food is digested in
animals
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A cavity in the body of some animals
where the gut and organs are located
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Coelom
A cavity in the body of some animals
where the gut and organs are located
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A circulatory system consisting of a
heart that pumps blood through
spaces called sinuses
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Open circulatory system
A circulatory system consisting of a heart
that pumps blood through spaces called
sinuses
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A circulatory system in which a heart
circulates blood through a network of
vessels that forms a closed loop
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Closed circulatory system
A circulatory system in which a heart
circulates blood through a network of
vessels that forms a closed loop
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One of many identical or almost
identical repeating body parts
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Segment
One of many identical or almost identical
repeating body parts
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An external skeleton made of
protein and chitin found in
arthropods
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Exoskeleton
An external skeleton made of protein
and chitin found in arthropods
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An eye that is made of many identical
units, or eyes, that work together
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Compound eye
An eye that is made of many identical
units, or eyes, that work together
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Feelers on an arthropod’s head that
respond to touch or taste
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Antennae
Feelers on an arthropod’s head that
respond to touch or taste
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A jaw found on some arthropods
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Mandible
A jaw found on some arthropods
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A process in which an insect or other
animal changes form as it develops
from an embryo or larva to an adult
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Metamorphosis
A process in which an insect or other
animal changes form as it develops
from an embryo or larva to an adult
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An internal skeleton
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Endoskeleton
An internal skeleton
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A system of water pumps and canals
found in all echinoderms that allows
them to move, eat, and breathe
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Water Vascular System
A system of water pumps and canals
found in all echinoderms that allows
them to move, eat, and breathe
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