Science Unit A Chapter 2 Animals
Terms in this set (15)
the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
hard protective structure developed outside the body, as the shell of a lobster
to shed hair, skin, or an outer layer periodically
An organ that removes oxygen from water
cold-blooded vertebrate typically living on land but breeding in water
A cold blooded vertebrate with scaly skin that lays eggs with tough, leathery shells.
A warm-blooded vertebrate that feeds its young milk.
An endothermic vertebrate that is covered in feathers, breathes through lungs and lays hard-shelled eggs.
A cold blooded vertebrate that lives in the water and has fins.
The way an organism reacts to changes in its internal condition or external environment.
a behavior that an organism inherits and knows how to do without being taught
a simple, automatic response to a sensory stimulus, such as the knee-jerk response
An action or change in behavior that occurs as a result of a stimulus.
An animal without a backbone
An animal with a backbone