Science test Flashcards
(13 cards)
Cnidarians
Invertebrates that have stinging cells and take food into a central body cavity
Mollusks
Invertebrates with soft, unsegmented bodies that are often protected by a hard shell
Arthropods
Invertebrates that have hard outer coverings, segmented bodies, and pairs of jointed appendages
Exoskeleton
The outer coverings, or outer skeleton
Echinoderm
An invertebrate that has an internal skeleton and a system of fluid-filled tubes
Endoskeleton
An internal skeleton
About 96 percent of known animals are what?
Invertebrates
What are all vertebrates?
Chordates
How would you describe an ectothermic animals?
An animal that depends on the sun to raise its temperature
What is the highest level of organization an animal can have?
Organ System
The process that the body uses to maintain a stable internal environment is called what?
Homeostasis
All worms have what kind of symmetry?
Bilateral
What does a placenta do for the mothers offspring?
It passes materials between a mother and her offspring before it is born
