a creature's shell or hard protective covering

An arthropod is an invertebrate animal with an exoskeleton, a segmented body, and paired, jointed appendages. Name two of them.

Warm-blooded is to cold-blooded as internal is to _____.

Together mates produce offspring. Select three pairs.

Air is composed of several gases. Select three that apply.

Blood is a specialized body fluid. It has several main components. Select three of them.

Symbiosis is an interaction between two different organisms living near each other.  Name two of them.

Any living cell in a dry environment will become dehydrated through _____ and eventually die.

An infant that is placed in a cold, drafty environment will _____ with crying. Select the two best options.