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 central axis
radial symmerty
a body plan in which an organism can not be divided into any two parts that are nearly mirror images
asymmetry
an inherited trait that increases an organisms chance of survivng and reproducing in a particular environment
adaptation
a fluid-filled internal cavity surrounded by muscle tissue
hydrostatic skeleton
a think hard outer covering protects ang supports an animals bodya think hard outer covering protects ang supports an animals body
ectoskeleton
the internal rigid framework that supports humans and other animals
endoskeleton
an animal that survive by living inside or on another organism get food from the organism and does not help in the organism survival
parasite
a thin layer of tissue that covers a mollusk’s internal organsa thin layer of tissue that covers a mollusk’s internal organs
mantle
a process in which an outer covering such as an exoskeleton is shed and replaced
molting
a developmental process in which the body from 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 pounch
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 the 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
