?
In Latin what does " Echino" mean?
In Greek it means spiny.
what are there arms called?
They are called "rays".
How many rays do star fish have?
5 rays.
what do sponges eat?
They eat plankton.
How many years do sponges go back?
They go back almost 600 million years.
what does the work " derm" mean.
it latin the word derm means skin.
How many multiples can they contain up to?
They can go up to multiples of 50.
are sponges vertebrates or invertebrates?
They are invertebrates.
can sponges see or are they blind?
They are blind.
Are sea urchins flat or spiky?
They are spiky because of their spine.
what does the word "Echinoderm" mean?
Spiny Skin
Do they have radial symmetry or bilateral symmetry?
They have radial symmetry.
do they have organ tissues or regular ones?
They have neither.
Can sponges reproduce?
Meaning can they give birth?
Yes, they can reproduce.
are sea urchins poisonous?
Yes they are.
They are invertebrates.
what are there feet called?
Tube feet.
what is the osculum.
The osculum is the opening of the sponge.
what are spicules?
They are skeleton-like figures that support the structure of the sponge.
are sand dollars flat of are they spiky.
They are flat.
what are they made up out of?
They are made out of something called calcium carbonate.
Sea Stars. how many sides do they have?
2 sides top to bottom.
what is the spongocoel?
it's where the water enters through the pores.
What are spongin?
They are protein fibers.
what do collar cells do for the sponges.
They help them eat in aid.