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Porifera/Cnidarians/Worms (1ESO)
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These flatworms inhabit humid climates and can be found in seas, rivers, and lakes.
planarians
Parasites that live in the intestines of many animals (including humans).
tapeworms
The concentration of nerve centers at the "head" of the animal's body is known as
 
cephalisation
 
planariation
 
filtration
 
spicules
The simplest animals that have bilateral symmetry and cephalisation of the nervous system.
flatworms
Which of these statements about worms is NOT true:
 
They have radial symmetry.
 
They tend to live in humid climates.
 
They have bilateral symmetry.
 
They do not have jointed appendages.
Cnidarians are
 
carnivores
 
omnivores
 
herbivores
 
cannibals
Stinging cells with a coiled flagellum that can inject liquid into prey to paralyse them. They are found in the tentacles of jellyfish.
cnidoblasts
This type of skeleton allows jellyfish to keep their shape by collecting water inside their cells.
hydrostatic skeleton
Umbrella-shaped sea cnidarians are called _______.
jellyfish
Sac-shaped sessile cnidarians are called ________.
polyps
Aquatic animals that have radial symmetry. Their cells are grouped in simple tissues. Some have organs.
cnidarians
Cells that form the pores which let the water flow through the porifera.
porocytes
A hollow space inside the bodies of porifera that have radial symmetry.
central cavity
Cells situated in the external layer of the sponge.
incurrent pores
Water, containing waste products, that leaves the central cavity, is released through this hole.
osculum
Cells that coat the inner cavity, creating a flow of water.
choanocytes
These are the simplest invertebrate animals. AKA sponges.
porifera