What is special about earthworm?
An earthworm has a streamlined body with no antennae or fins or arms or legs! This streamlined shape is an adaptation to living in narrow burrows underground and the need to move easily through the soil. An earthworm has circular muscles that surround each body segment.
What is unique about earthworm gender?
Earthworms are hermaphrodites; that is, they have both male and female sexual organs. The sexual organs are located in segments 9 to 15. As a result, segment 15 of one worm exudes sperm into segments 9 and 10 with its storage vesicles of its mate. Some species use external spermatophores for sperm transfer.
What type of body symmetry Do earthworms have?
Earthworms have bilateral symmetry. This means that if you cut the earthworm down the centerline, the left side of the body would be identical to the right side.
How many hearts does a worm have?
Heartbeats: Worms don’t have just one heart. They have FIVE! But their hearts and circulatory system aren’t as complicated as ours — maybe because their blood doesn’t have to go to so many body parts.
Do worms teeth?
Worms have strong, muscular mouths, but no teeth. They have a varied diet that includes decaying vegetation, soil, dead animals and even some living organisms. Earthworms are essential.
Does an earthworm have radial symmetry?
Yes, it has radial symmetry. What kind of symmetry does an earthworm have? Bilateral symmetry if you cut it down the middle.
Why do earthworms have bilateral symmetry?
Bilateral symmetry means that one vertical cut can split the animal into two equal halves because if we cut the earthworm straight down the middle, we will get two equal/identical parts.
Do earthworms have teeth?
Earthworms certainly do not have teeth;they don’t need them because they absorb nutrients from the soil with their bodies.
What are some cool facts about worms?
Worms live in the dark, and are very sensitive to light. Worms do not have eyes, but can detect light through their skin. Worms will move away from light so that their skin stays moist. If worms are exposed to light for about an hour, they will become paralyzed and unable to burrow back into the darkness.
What is the largest earthworm?
The biggest known earthworm is the giant Gippsland earthworm, found in Australia. It is usually about 80 cm in length, but can grow to about 3 meters. The most common earthworm (in Europe, and most other temperate climate regions) grows to a size of about 20–25 cm when extended.
How do earthworms get into soil?
Organic Material. Earthworms contribute to soil formation by assisting in the decomposition and incorporation of organic materials into the soil. Earthworms eat leaves and dead roots found on or near the soil’s surface. They mix this organic material into the soil by tearing off portions of plant material and burying it deep within the earth.