Chapter 9 Flashcards
a body plan in which an organism can be divided into two parts that are nearly mirror images of each other
bilateral symmetry
a body plan in which an organism can be divided into two parts that are nearly mirror images of each other anywhere through its center axis
radial symmetry
a body plan in which an organism cannot be divided into any two parts that are nearly mirror images
asymmetry
a fluid-filled internal cavity surrounding by muscle tissue
hydrostatic skeleton
an inherited trait that increases an organisms chance of surviving and reproduction in a particular enviorment
adaptation
a thick hard outer covering protects and supports an animals body
exoskeleton
the internal rigid framework that supports humans and other animals
endoskeleton
an animal that survives by living inside or on another organism gets food from the organism and does not help in the organisms survival
parasite
a thin layer of tissue that covers a mollusks internal organs
mantle
a processing which an outer covering such as an exoskeleton is shed and replaced
molting
a developmental process in which the body form of an animal changes as it grows from an egg to an adult
metamorphosis
a flexible rod-shaped structure that supports the body of a developing chordate
notochord
grooves along the side of a developing chordate
pharyngeal pouch
an organ that exchange cardon dioxide for oxygen and water
gill
a protective membrane that surrounds an embryo
amnion
an animal that heats its body from heat in its enviroment
ectotherrm
an animal that generates its body heat from the inside
endotherm
special tissue that produces milk for young mammals
mammary glad
