Invertebrates 1 Flashcards
all animals:
are many-celled, ingest food, don’t have chlorophyll
first animals evolved from
single-celled protists
four levels of animal organization
cells
tissue
organs
organ systems
example of animals that have tissue but no organs
cnidarians
animals are sometimes classified by
if they have radial, bilateral, or no symmetry
animals with backbones are called
vertebrates
animals with no backbones are called
invertebrates
the scientific name of sponges is
porifera because they have pores
a sponge uses it’s pores to
get food
how do sponges eat
filters through water, taking out nutrients and small organisms, then gets rid of water through pores
what is the method of eating that sponges use called
filter feeding
a sponge is made up of how many types of cells
3
what are the names of the cells of sponges
coller cells have the flagella, the ameba like cells carry food and waste through the body, and the last type are the outer layer cells
how do sponges reproduce
sexually and asexually
how can you tell which gender a sponge is
you can’t. they are all both female and male
after it is a fertilized egg but before it gets rooted to the ground it is a
larva
most well known cnidarian
jellyfish
what is a cnidarian
organism armed with stinging cells that lives underwater
two main body forms of a cnidarian
polyps and medusas
cnidarians have what symmetry
radial
in cnidarians that are only polyps, how do they reproduce
sexually
what 3 groups are cnidarians split into
sea anemones
polyps all their lives
hydrozoans
most are both polyps and medusa
jelly fish
spend most of their lives as medusa
what do cnidarians bulid
coral reefs
how do worms differ from cnidarians
have bilateral symmetry
3 layers of tissue instead of 2
