Porifera
are sponges symmetrical? always, sometimes, or never?
never
do sponges have stomachs?
no
name 3 cnidarians
jellyfish, sea anemones, and polyps
do jellyfish and anemones have exoskeletons?
no, they have no exoskeletons
where do polyps and coral live? (water depth and temperature)
warm, tropical, shallow water
what is the name of the small holes on a sponges' body?
pores
how do sponges eat and get nutrients?
they absorb food through their whole bodies. water flows through the pores and filters out food
are cnidarians symmetrical? what kind of symmetry?
yes! they have radial symmetry
describe the shape of a jellyfish
bell-shaped with tentacles underneath
how are coral reefs made?
over hundreds or thousands of years, coral and polyps collect together and grow into large walls
what is a hermaphrodite?
organisms that have both male and female reproductive organs
how to sponges reproduce? (2 answers)
sexually and asexually
what do Cnidarians eat?
zooplankton, they are carnivores
how do jellyfish move?
slowly, they float through the water with the ocean currents
how is coral made?
colonies/collections of polyp grow together and form exoskeletons from minerals in the water
what do sponges eat? (3 answers)
- bacteria
- small pieces of animals
- small pieces of plants
how many pores do sponges have? (not a number)
many!
how do cnidarians catch and kill their prey (food)
they use their stinging tentacles to poison their prey
anemones live in shallow water on the sea floor
why are coral reefs important? why should we protect them?
the provide homes to many species of fish and other animals
where in a marine ecosystem do sponges live?
on the bottom of the sea floor
describe how a sponge can produce asexually
a part of their body breaks off and grows into a new sponge
do all cnidarians live in salt water? where do they live?
mostly salt water, in marine ecosystems... but a few live in freshwater ecosystems
why are jellyfish and anemones considered invertebrates if they don't have an exoskeleton?
an invertebrate is an animal with no backbone... not all of them have exoskeletons
what is a big danger to coral reefs and polyps? (4)
changes in the environment:
- pollution - humans - hurricanes - changes in seawater temperature
can all kill polyps and destroy the reef