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33 Cards in this Set

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  • Back
What are invertebrates?
Animals without a backbone.
What are animals that only eat meat?
carnivores
What are animals that eat plants and meat?
omnivores
What are animals that only eat plants?
herbivores
What organisms do not need other organisms for food or shelter?
free-living organisms
What is it called when body parts are arranged around a central point?
radial symmetry
What are animals with a backbone?
vertebrates
What is it called when body parts are arranged in a similar way on both sides?
bilateral symmetry
What is it called when an organism has no shape?
asymmetrical
What are organisms that remain attached to one place during their lifetimes called?
sessile
What is an adaptation in which one animal closely resembles another animal?
mimicry
What organism have asymmetrical form?
Most sponges
What are pores?
Many small openings that cover the body of a sponge.
What help move water through a sponge?
spongin
What are spicules?
Sharp structures on the bodies of many sponges.
What kind of feeder is a sponge?
filter feeder
What animal has both a mouth and anus?
roundworm
How do sponges and cnidarians reproduce?
asexually and sexually
Where do most cnidarians live?
oceans
What body form do cnidarians have?
radial symmetry
What body form do flatworms and roundworms have?
bilateral symmetry
What organism lacks a digestive system?
tapeworms
What is an example of a sessile organism?
sponge
What are the characteristics of animals?
made up of many cells,eukaryotic cells, cannot make their own food,
digest their food, many can move,
capable of reproduction
What characteristic do all animals have?
digest their food
What is an example of a cnidarian?
jellyfish
How do sponges reproduce sexually?
budding
Which group do roundworms belong to?
nematodes
What are the two body forms of cnidarians?
medusa and polyp
What armlike structures surround the mouths of most jellyfish?
tentacles
How do polyps reproduce?
Asexually by budding
How do medusa reproduce?
Sexually by egg and sperm
Why do scientists think the medusa stage was the first stage of the cnidarians?
Because the polyp stage develops from the medusa.