pancreas [pan cree us]
A gland near the stomach that secretes the hormone insulin and pancreatic juices
percent daily value
On a nutritional label, that portion of the daily suggested allotment of a particular nutrient provided by one serving of a food.
perspiration (purr spi ray shun]
Also called sweating; the loss of a salty fluid through the pores of the skin.
phytoplankton [fye toe plank tun]
Very small plants that float freely in water, such as one-celled algae.
pigment [pig mint]
The coloring material in special cells of animals or plants. For example, the pigment called chlorophyll makes some plants look green.
predator [pred a tor]
A carnivorous (meat-eating) animal that hunts and eats other animals to live.
protein [pro teen]
A type of chemical made up of amino acids. Proteins are very important to all living organisms because they are what all living things are made of. Just like a bicyle is made of metal tubes, plastic, nuts, and bolts, a living organism is made of proteins. Some proteins form the structures in the body including cell membranes and muscular fibers. Other proteins function as enzymes that allow important chemical reactions to take place.