Vocab Ch2 Flashcards
Chordate
an animal that has the beginnings of a backbone during one or more stages of development (notochord)
Exoskeleton
a hard, external covering of an animal
Ectotherm
a cold-blooded animal whose body temperature fluctuates with the temperature of its environment
Appendage
an external structure that extends from the main body
Endotherm
a warm-blooded animal that maintains a constant internal temperature
Keratin
a strong, structural protein found in skin, hair, nails, and feathers
Arthropod
an invertebrate that has a segmented body, jointed appendages, and usually an exoskeleton
Crustacean
a mainly aquatic arthropod that has a hard exoskeleton and two pairs of antennae
Mollusk
an invertebrate with a soft body that is typically enclosed in a shell
Echinoderm
an invertebrate that exhibits radial symmetry and a tough, spiny skin
Cnidarian
an invertebrate with radial symmetry, a soft body, and tentacles with stinging capability
Poriferan
an invertebrate with a porous, asymmetrical body that pumps and filters water
Ostia
the small pores through which water and nutrients enter a sponge
Biome
a large region that has a particular climate and specific plants and animals
