Chapter 9 cards
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a body plan in which an organism can be divided into two parts that are nearly mirror images of each other.
bilateral symmetry
body plan in which 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 cannot be divided into any two parts that are nearly mirror images.
asymmetry
an inherited trait that increases an organism’s chance of surviving and reproducing in a particular environment.
adaptation
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 inside or on another organism,gets food from the organism,and does not help in the organism’s survival.
parasite
a thin layer of tissue that covers a mollusk’s internal organs.
mantle
a process in which an outer covering,such an an exoskeleton, is shed and replaced.
molting
a develop mental 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 an embryo.
amnion
an animal that heats its body from heat in its environment.
ectotherm
an animal that generates its body heat from the inside.
endotherm
special tissue that produces milk for young mammals.
mammary gland