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  ____ .

Which of the following structures is not found in bryophytes?

Echinoderms have ___________.

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 is NOT a characteristic of Bacteria and Archaea?

Match the animal with its phylum.

Identify the protist below. 

Which of the following feather types helps to reduce drag produced by wind resistance during flight?