Ch 9 what are animals Flashcards
A body plan in which an organism can be divided into two parts that are nearly mirror images of each other
bilateral symmetry
has a body plan which can be divided into two parts that are nearly mirror images of each other anywhere through its central axis
radical symmetry
meaning they have body plans which cannot be divided into any two parts that are nearly mirror images.
asymmetry
is an inherited trait that increases an organisms chance s of surviving and reproducing in its environment
adaptation
a fluid-filled internal cavity surrounded by muscle tissue
hydrostatic skeleton
thick, hard outer covering
exoskeleton
internal rigid framework that supports you and other animals
endoskeleton
animals that survive by living inside or on another organism, get food from the organism and do not help in the organisms survival
parasites
a thin layer of tissue that covers a mollusk’s internal organs
mantle
an outer layer covering is shed
molting
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 pouches
organs the exchange carbon dioxide for oxygen in the water
gills
a protective membrane that surrounds the embryo
amnion
animals that heat their bodies from heat in their environments
ectotherms
animals that generate their body heat from the inside
endotherms
special tissues that produce milk for young mammals
mammary glands
