inherited charateristic that increases an organisms chance of survival
egg composed of shell and membranes that create a protected enviorment in wich the embryo can develop out of the water
ability to merge visual images from both eyes, wich provides depth perception and a three-dimensional veiw of the world
term used to refer to two-footed locomotion
the act of concealing the identity of something by modifying its appearance
in crustaceans, the part of the exoskeleton that covers the cephalothorax
outer layer of the cerebrum of a mammal's brain
in earthworms, part of the digestive system in wich food can be stored
difference, variety; a condition of having many different types of forms
animal that relies on interactions with the enviorment to help it control body temperature
animal that generates its own body heat and controls its body temperature
in earthworms, part of the digestive system in wich food is ground into smaller peices
cessation from or slowing of activity during the winter
primate that walks upright, has opposable thumbs and possesses a large brain
member of a group of primates that includes apes and humans
vertebrates that live on land, fur or hair covers body, live birth, warm blooded
gland in mammals that produces milk to nourish the young
mammal wich bears live young that complete their development in an external pouch
periodic movement and return of animals from one place to another
the resemblance of an animal species to another species or to natural objects
thumb that enabels grasping objects and using tools
organ in placmental mammals through wich nutrients, oxygen, carbon dioxide, and waste are exchanged between embryo and mother
ventral part of a turtle's or tortoise's shell
with few execeptions, small, nocturnal primate that has large eyes for seeing in the dark
any vertabrate that has dry scaly skin, lungs, and terrestrial eggs with several protective membranes
layer of fat cells beneath the skin
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