The Earthworm
The digestive system starts at the head and goes all the way down to the end of the tail. The decaying food goes in the pharynx(a organ that helps the
worm suck soil in through the mouth). The food then goes through the esophagus. After that, it enters a thin-walled storage organ for food, the crop. Then, the food goes to the gizzard (a thick-walled organ that grinds soil into a pulp). From the gizzard, food goes through the intestine that runs the whole length of the worm's body. The anus then releases castings, undigested soil, and mineral particles.
The Frog
The digestion system functions are chemical and
mechanical breakdown of nutrients. The frog has many
organs that take up most of its abdominal cavity.
Beginning at the mouth, the frog has a sticky tongue that
it catches its prey with. The whole prey (food) is then pushed down to the
esophagus.The food goes from the esophagus to the stomach. Following
in the small intestine where the nutrients are absorbed. After that, the food is lead to a narrow point where the small intestine meets the large intestine. The large intestine then adsorbs water and collects the waste, and ends at the cloaca.
The Squid
The squid's digestive system is in a form that loops. Food enters the mouth, where the black chitinous beaktears the prey into pieces. The food is then moved through the esophagus. Then, it travels to the stomach, which is a very muscular organ and primary site of chemical and physical digestion. The stomach is attached to the cecum, where the food is stored (where nutrients are absorbed). This processes is passed through most of the body length, before it loops back and goes through the
anus.
Similarities:
Both squids and frog's digestive system involves chemical and physical.
All 3 animals digestive system takes up most of the space of their bodies.
All 3 animals food stars at the mouth and ends with the anus.
I hope this helps!!!!!!
