The two organisms discussed in this report are humans and frogs. The taxonomy of an organism includes kingdom, phylum, class, order, family, genus, and species. Humans are classified into the kingdom Animalia, phylum chordates, class Mammalia, order Primates, family Hominids, genus Homo, and species Homo sapiens. Frogs are classified as the kingdom Animalia, the phylum Chordates, and the genus and species Rana pipens. The frog's habitat is usually spent on land for most of its adult life. However, the reproduction and development of frogs must take place in water or in a humid place. Some adaptations that frogs have that aid in their survival are thin skin that contains glands that secrete mucus. They also have two pairs of limbs, which can be used for swimming, jumping or walking. The anatomy of a frog is very similar to human anatomy. Both humans and frogs have the same types of organs and organ systems. Digestion in a frog begins in the mouth. Although the frog has teeth, they are practically useless. However, the frog's tongue is very important. Most of the time the tongue is curled back towards the throat. From here the frog is able to stick out its tongue very quickly to capture its prey. The tongue is also very sticky. From the frog's mouth, food passes into the stomach through the esophagus. From there the food moves into the small intestine. This is where most of the digestion occurs. There are large digestive glands, the liver and pancreas, connected by ducts. Liquid waste from the kidneys passes through the ureters into the urinary bladder. Solid waste from the large intestine ends up in the cloaca. Both liquid and solid wastes leave the body through the cloaca. The digestive system in humans is much more complicated. In humans, digestion occurs in the mouth. Once food enters the mouth, chewing and saliva begin to break it down and make it easier to swallow. Then the food goes down the esophagus to the stomach. In the stomach, contractions of the muscle wall continue to mechanically break down food. Chemical digestion continues as acid and enzymes are secreted into the stomach cavity. Then the food passes through the small intestine. Here the enzymes of the pancreas complete the chemical part of digestion. Fat is digested with bile. Bile is produced in the liver and stored in the gallbladder. Whatever remains of the food, mo... half the paper... the per glands mix with the sperm to form sperm. Each testicle is made up of small, coiled tubes called sleeping tubules. From there, immature sperm pass through the epididymis, which is a storage area at the upper back of each testicle. The vas deferens is a tube that leads upward from each testicle into the lower part of the abdomen. The two vas deferens empty into the urethra. The female reproductive system is somewhat similar to that of frogs. In the female reproductive system, the ovaries produce the female sex hormones estrogen and progesterone. In the ovaries, eggs mature in follicles. Fertilization can occur when the follicle ruptures and the egg is released into the oviduct. Locomotion in the frog is similar to that of humans. Frogs use jointed appendages. The frog's legs are extremely muscular and are sometimes compared to human arms. Unlike humans, the frog has only four toes, which are twisted together. They are tied together because they often have to move through the water. The webbed feature allows for easy swimming. A frog uses all four appendages to move. Usually hopping. A human being uses only two, his legs.