_____________ a tissue that is more flexible than bone.

A ___________ is a place where two or more parts of a skeleton meet.

___________, tissues that contract or relax to create movement.

A _______________ receives information from the environment and coordinates a response.

A signal that causes an animal to react in some way is called a ______________.

A ____________ is an animal's reaction to a stimulus

A ___________ is a nerve cell with a unique structure for receiving and passing on information.

In a nerve cell, information travels as an electrical message called ____________.

________________ are nerve cells that detect stimuli.

______________ are nerve cells that pass information between neurons.

_______________ are nerve cells that carry response information to muscles and other organs.

A _________ is an organized grouping of neurons in the head of an animal with bilateral symmetry.

Sea stars and other echinoderms have a ________________, a system of fluid-filled tubes

A ______________ is an internal, gas-filled sac.

Animals that eat only other animals are _________________.

Animals that only eat plant material are ________________.

Animals that eat both plant material and other animals are _________________.

_______________ are animals that live in water that strain their food from the water.

The process that breaks down food into small molecules is called _______________.