The characteristic that is common to all Cnidarians is:    

Cells occur singly and have a nucleus and other organelles, including chloroplasts. These cells move with flagella.  They are ______  

A zoologist discovers a vertebrate unknown to science and thinks it is related to lampreys. Which of the following characteristics would lead her to this conclusion?  

The gametophyte generation in angiosperms is contained in the:  

Organisms that use the sun’s rays as an energy source and the atmosphere as a source of carbon are:    

The first organisms on Earth were:    

In the digestive system, the villi are:  

Most of the oxygen in human blood is carried:   

How do fungi obtain food?  

One type of bacterium that has a corkscrew shape and causes the disease syphilis is: