The liquid portion of blood that contains metabolites, wastes, hormones, ions, and a variety of proteins is called the ________.

Describe the electrical components of the heart and their role in regulating contraction and relaxation of cardiac muscle.

Explain how bacteria, protists, and even some animals can survive without respiratory organs. Be sure to clearly define gas exchange in your answer including which gases are  being exchanged. 

Squids and octopuses move by means of water movement through their

All mammals have hair, mammary glands, and a placenta.

Each human kidney contains about a million ________, which are the tubular functional units of the kidney.

All of the following are either structures or characteristics of members of the Class Bivalvia of the Phylum Mollusca except

The close proximity of capillaries to the alveoli in lungs improve respiratory efficiency by ________.

How do humans use agar isolated from red algae?

A true coelom (body cavity) is completely lined with: