Chapter 9- Introduction to Animals

structures and behaviors that allow animals to perform their functions

The condition in which an organism’s internal environment is kept stable in spite of changes in the external environment.

an animal with a backbone

an animal without a backbone

group of similar cells that perform a specific function

made up of tissue

body plan in which any number of imaginary lines that all pass through a central point divide the animal into two mirror images

body plan in which a single imaginary line divides the body into left and right sides that are mirror images of each other

invertebrate that uses stinging cells to capture food and defend itself ex. jellyfish, coral

invertebrate with a soft body with a hard shell that protects the body

invertebrate that has an external skeleton, a segmented body, and jointed appendages

outer skeleton

animal that has a nerve cord, a notochord, and throat pouches at some point in its life

flexible rod that supports a chordate’s back just below the nerve cord

bones that make up the backbone of an organism

animal whose body temperature is determined by the temperature of its environment

animal whose body temperature is regulated by the internal heat the animal produces

vertebrate that lives under water, and use fins to move

tissue more flexible than bones

ectothermic vertebrate that spends early life in water and adult life on land

ectothermic vertebrate that has scaly skin and lungs, and lay eggs on land

ectothermic vertebrate that lays eggs and has feathers and a four-chambered heart

endothermic vertebrate that have skin covered with fur or hair, and a four-chambered heart

organs that produce milk to feed the young