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 it central axis.
radial symmetry
a body plan in which an organism can not be divided into two parts that are nearly mirror images of each other.
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 prosses in which an outer covering, such as an exoskeleton, is shed and replaced
molting
a development prosess in which the body form of an animal changes as it grows from an egg to an adult
metamorphosis
a flexible, rod shaped structure the 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 from its environment
ectotherm
an animal that generates its body heat from the inside.
endotherm
special tissue that produces milk for young mammals.
mammary gland
