Homeostasis
Condition in which an organism's internal environment remains stable in spite of changes externally in the environment
Adaptation
Inherited behavior or physical characteristic that helps organisms survive and reproduce
Vertebrate
An animal with a backbone
Invertebrate
An animal without a backbone
Tissue
A group of similar cells that perform a specific function
Organ
Body structure composed of varied tissues that all work together
Radial symmetry
Body plan that any number of imaginary lines passing through a central point divide the animal into identical images
Bilateral symmetry
Body plan that one imaginary line divides the body into identical images (with a left and right side)
Cnidarian
A radially symmetrical invertebrate that uses stinging cells to catch food and defend itself
Mollusk
Invertebrate with a soft, unsegmented body (protected with hard shell)
Arthropod
Invertebrate with a segmented body, external skeleton, and jointed appendages
Exoskeleton
External skeleton; tough, waterproof outer coat that protects, supports, and prevents evaporation
Echinoderm
Radially symmetrical marine invertebrate with internal skeleton (endoskeleton) and fluid-filled tube system
Endoskeleton
Internal skeleton; structural support system inside animal
Chordate
Animal with a notochord, nerve cord, and throat pouches at one point
Notochord
Flexible rod supporting chordate's back (below nerve cord)
Vertebrae
Bones making up backbone (26 in human body)
Ectotherm
Animal whose body temperature is decided by temperature of its surroundings
Endotherm
Animal whose body temperature is decided by internal heat produced by it
Fish
Vertebrate, ectotherm, and lives in the water with fins
Cartilage
Flexible connective tissue that protects bones from rubbing together
Amphibian
Vertebrate, ectotherm, and lives childhood in water, and adulthood on land
Reptile
Vertebrate, ectotherm, with lungs, scaly skin, and lays eggs on land
Bird
Vertebrate, endotherm, lays eggs, has 4 chambered heart, and has feathers
Mammal
Vertebrate, endotherm, with milk-producing glands, and skin with hair/fur
Mammary gland
Organ in female mammal that makes milk for kids
Monotreme
Mammal that lays eggs
Marsupial
Mammal whose young develop in mother's pouch and are born at early development
Placental mammal
Mammal that develops in mom until ready to function independently
Placenta
Organ in pregnant mammals that connects mom with developing embryo, so they can pass materials