sponges have been around for ___________ million years
500
sponges come in all _______ and ________
shapes and sizes
some corals get their energy from ________ living within their tissue
algae
spicules determine the _____________ of a sponge
feel
where do jellyfish spend the beginning of their lives
on the ocean floor
what do jellyfish use their tentacles for
to catch prey
cnidarians have _________ symmetry
radial
sponges are very useful for __________
medicines
how does algae make food
photosynthesis
there are over __________ species of sponges
8500
where can you find cnidarians besides the ocean
fresh water
sponges dont have a heart or a _____________
brain
what does coral provide for algae
a safe place to live