Difference between the morphology of earth worm and frog
Answers
FROG:
Frogs have highly specialized structures, such as a long, sticky tongue.
They also have other structures however, that appear useless. Their weak teeth are an example of this.
Frogs breathe through their skin when underwater. They also have a pair of lungs that allow them to breathe on land.
Frogs have a three-chambered heart and a vertebral column that consists of nine vertebrae.
Frogs breathe through their skin when underwater. Oxygen in the water can pass through their porous skin and go directly to the blood. They also have a pair of lungs that allow them to breathe when on land.
They also have a highly developed sense of sight and smell. Frogs can detect predators and prey using their large eyes that protrude from their head. They use their keen sense of smell to detect chemical signals that help them identify potential food.
EARTHWORMS:
The basic morphology of an earthworm is a tube, the digestive system, within a tube, the muscular outer body. The body is annular, formed of segments that are most specialized in the anterior.
Earthworms have a simple circulatory system. They have two main blood vessels that extend through the length of their body: a ventral blood vessel which leads the blood to the posterior end, and a dorsal blood vessel which leads to the anterior end.
The dorsal vessel is contractile and pumps blood forward, where it is pumped into the ventral vessel by a series of "hearts" (aortic arches) which vary in number in the different taxa. A typical lumbricid will have 5 pairs of hearts.
The blood is distributed from the ventral vessel into capillaries on the body wall and other organs and into a vascular sinus in the gut wall where gases and nutrients are exchanged.
This arrangement may be complicated in the various groups by suboesophageal, supraoesophageal, parietal and neural vessels, but the basic arrangement holds in all earthworms.
Earthworms eat in a unique way: their mouth cavity connects directly into the digestive tract without any intermediate processes. Most earthworms are decomposers feeding on undecayed leaf and other plant matter, others are more geophagous.
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