Dissecting a turtle's excretory system is an experiential way for students to learn the intricacies of physiological biology. By peering inside the turtle's body, you can see firsthand how the final part of the turtle's digestive system functions. The turtle's excretory system consists of the kidneys, bladder, urethra and large intestines, meaning there are a number of important organs that will be covered in this exercise.

Imagine relaxing on a summer day next to a glistening garden pond with beautiful flowering plants and exotic colorful fish gliding by.
You may have seen elaborate Japanese garden-type ponds, complete with bridges and waterfalls and thought, "Beautiful, but way beyond my budget!" Think again - there's a potential pond to suit any pocketbook.

Sea sponges are bottom-dwelling animals that stay fixed to solid objects along the ocean floor. They spend their lives filtering the seawater to absorb enough nutrients to survive and reproduce. They are found throughout the world in the extreme cold water of the polar seas to the warm waters of the equator. Certain species, due to texture, are best used for bathing, where other species are best for exfoliation.

Shark teeth are some of the most common and popular fossils in the world, and they are used to study shark biology and evolution. Found on beaches throughout the world, they've become a staple in fossil collections. The variety of sharks that have roamed the oceans for millions of years has led to an equally impressive variety of teeth.

The manatee, also called a sea cow, inhabits the coastal waters of Florida. These large, slow mammals were classified as an endangered species in 1967, but despite conservation efforts, their numbers have continued to decline. As of 2007, only an estimated 2,400 were left in Florida. The two biggest dangers to manatees are careless boaters who accidentally kill dozens each year by running into them, and continued coastline development. If you want to save manatees, there are several things you can do.