The large central opening in the Parazoan body is called the ___________.

The most common plants are the bryophytes. 

Bacteria reproduce by ______.

Echinoderms have ___________.

Identify the parts of the flower.

Match each part to the correct description.

Which is NOT a characteristic of Bacteria and Archaea?

Imagine a scar on a 15-foot tree, 3 feet above the ground. Over the next 10 years the tree adds 15 feet to its height. What is the approximate position of the scar?

Which of the statements about biofilms is incorrect?

Lichens are extremely common. The casual observer does not realize that lichens are  ____ .