chapter 9 Flashcards
a body plan in which an organism can be divided into two parts that are nearly mirror images of each othjer
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 central axis
radial symmetry
a body plan in which an organism can be divided into two parts that are nearly mirror images
asymmetry
a fluid filled internal cavity surrounded by muscle tissue
hydrostatic skeleton
a thick hard outer covering; protects and supports an animal’s body
exoskeleton
the internal rigid framework that supports humans and other animals
endoskeleton
an animal that survives by living in or on another organism, gets food from the organism, and does not help in the organism’s survival
parasite
a thinlayer of tissue that covers a mollusk’s internal organs
mantle
a procces in 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 exchanges carbon dioxide for oxygen in the water
gill
a protective membrane that surrounds and embryo
amnion
an animal that heats its body from heat in its enviorment
ectotherm
an animal that generates its body heat from the inside
endotherm
special tissue that produces milk for young mammals
mammary gland
