Cells are the most basic unit of life and come in eukaryotic (plant and animal cells) and prokeryotic (bacteria) varieties. Multicellular organisms are made of eukaryotic cells which make up different tissues which work together perform certain tasks. These tissues make up organs which work to complete more complete tasks. Different organs work in organ systems which all work toward one complex function and organ systems make up the full organism.

Frogs and humans both display bilateral symmetry which means that their bodies (except some of the organs) are symmetrical along one line from the top/front of the body to the bottom/back of the body. The placement of the features in the face, limbs and many other features all follow this imaginary line. Frogs use their smooth skin as camouflage when looking at the frog under the water. But more interestingly, frogs can breathe through their skin, as long as it is moist, meaning they have another way to respirate besides their lungs and aren't dependent on their lungs for gas exchange. Frogs have similar faces to humans but have a unique structure called tympanum which detect sound similar to human ear drums. A frog's front legs have 4 toes and aren't used as often while the back legs have 5 toes and are used for the frog's famous jumps.

Frogs share a similar internal structure with humans with a heart in a central location toward the top of the body, and the main parts of the digestive system in the lower body. They also have a "through gut" meaning they take in food through the front of their body and expel waste through the back of their bodies. Frogs, however, frogs have much bigger livers, taking up a similar place as human lungs, while their lung is much smaller due to their ability to brethe through their skin. *choosing not to add an image of this diagram*

The muscular system shares the same function as that of in humans. They work to move separate parts of the body. The main part of the muscular system we looked at was the gastrocnemius which frogs use to jump off the ground using their back feet.

The cardiovascular system pumps blood to the rest of the body, distributing and carrying oxygen, just like in humans. Humans, however have slightly more complex hearts. The heart is separated into atrium, located in the top half, and ventricles,located in the bottom half. Both frogs and humans have the same amount of atrium, but frogs only have one ventricle while humans have 2 named the left and right ventricle respectively.

The respiratory system works in gas exchange by extracting oxygen from the air, just like in humans. Frogs , however, have much less development but into their lungs partly due to their ability to breathe through their skin. Frogs lack diaphragms, which are critical in humans to pull air into their lungs and have to do something different to get air into their lungs. First, the frog moves their throat down to draw air into the mouth, then the nostrils close before the throat moves back up to push the air down the throat to the lungs. Then the throat moves back down forcing the air out of the lungs before the nostrils reopen and the throat moves back up to force the air out of the nostrils. This process replaces the diaphragms function of pulling on the lungs to draw air in and out.

The digestive system works the same in both frogs and humans and works to take food and convert it into energy, producing waste. The food enters the stomach where the food is digested. organs the the pancreas and gallbladder also help with this process. The pancreas creates digestive enzymes and the gallbladder stores bile in both organisms.

The excretory system works similarly to humans but with some changes. Like humans, frogs have a small and large intestine which further processes waste before it reaches the cloaca, which humans do not possess. A cloaca is the exit to the excretory system which expels liquid and solid waste along with the organism's eggs.