How do earth worms mate?
457859
They are hermaphrodite, that means they've got both male and female organs, still they need a partner so that they can exchange sperm, they do it by mating. the sperm stored in the seminal receptacle is later used in the fertilization of eggs and are then released in a cocoon, the new earthworm come out in about 2-3 weeks.
839288
there part of a group of insects that only live a short while, a few weeks or more. so they have to find a mate quickly and reproduce, just nature thats all.
789645
It is a worm, some specie of leeches would suck the blood of larger animals.\nThe link has a picture.
475035
they lay eggs in clusters! many of them. and yes..they do have some sort of sex but not the version that you have in your mind.
356465
Just like an earth worm.  A peice breaks off and a new sponge is created.  Cool huh?
870767
WOW, wayyy too detailed of a question.... not gonna answer each part of this... "how it is possible?"  I mean, how broad is that? are you looking for actual hormone and neurotransmitter names and fuctions?  too broad..\n\nbut to answer... some fish, most plants are born XXY, platyhelminthes (roundworms)  and some cestodes, specific nematodes can change their sex... I believe the Ascaris Lumbricoides is my "favorite" sex change organism... it is a hermaphrodite and impregnates itself and lays eggs by itself.. without ever seeing another Ascaris.  (human parasite)
243769
Yep... they can... forming a worm hole...
895970
EARTHWORMS.  THEY FEED ON DECAYING PLANTS, DIGEST IT AND FERTILIZE THE SOIL WITH THEIR EXCREMENT.  ALSO, THE ":SLIME" THEY SECRETE ALSO KEEPS THE SOIL MOIST.
1094553
worms that infest humans are transmitted through contact with feces
414215
The gases move in and out by the process of diffusion.\n\nYou're right, the earthworm uses its skin to exchange gases.  As long as the earthworm's skin is moist, gases like oxygen and carbon dioxide can passively diffuse accross its skin.  This is why an earthworm will die if its skin dries out.  Beleive it or not, we also rely on the process of diffusion to exchange gases.  When we breathe air deep into our lungs, gases diffuse accross the thin, moist surfaces of our lung tissues.  Once a gas like oxygen diffuses into the earthworm, the circulatory system carries it (and other substances too, such as nutrients) to cells within the earthworm's body.  The circulatory system also allows the earthworm to transport waste products from the its cells to the outside environment.  For example, carbon dioxide produced by the earthworm's cells is transported through the circulatory system to the skin, where it can then diffuse out into the earthworm's surroundings.
718435
Cows and gazelles can mate, but they won't result in any offspring.  Other antelope and cows can mate and produce offspring, however.  The sitatunga is a medium-sized marsh-dwelling antelope.  The females are fuzzy, reddish with white spots, and hornless.  The males are two to three times larger, equally fuzzy, grayish with white spots, maned, and have spiral horns.  They are very unlike cows.  Sitatunga can mate and produce offspring with lesser kudus.  Lesser kudus, in turn, can hybridize with greater kudus, which can hybridize with elands.  Elands, despite being antelope, can hybridize with cattle.  Antelope and cattle are all bovids (true-horned artiodactyls), but gazelles, despite being antelope, are too far removed from cattle genetically to reproduce.  I hope this answers your question! ^_^\n\nIn response to the answer above:  horses and donkeys are of the same genus.  An example of an intergenus hybrid would be an eland/cow cross or an Asian/African elephant.
410584
Are the genes linked? I don't have my book with me here.\n\nIf not, mate a male with one of them. Take the male progeny from that mating and cross with the other mutant. Select hermaphrodites from the period of egg laying when the sex ratio is 1:1 (say the second 8-hour period after they're together). Allow these hermaphrodites to self and select double mutants from the progeny. I think this should do it, but you'd better draw it out.\n\nIf they're linked I think it will just be harder to find double mutant progeny in the final stage, again draw it out to check.
1147829
If you look at an adult worm closely, you will notice a band of white slime.  This is called the saddle, the place that the eggs are stored.When the eggs in the egg tube are ready, the worm slips backwards out of the saddle. As the saddle passes the egg tube, six eggs are dropped in.  As the saddle passes over the worm's head, the ends close up and make a tiny lemon-shaped cocoon with the eggs inside.  This cocoon protects them until they hatch out as very small but fully developed worms.
44144
Evolution of reproduction. Nature finds its way.
1132913
The spiral of a screw. Its also the lines segmenting a worm.\n*fyi: earthworms have 5 hearts*
474255
SInce the earthworm's environment is always wet or humid, it always contains some amount of water for the earthworms, so therefore, it is cool, but if a person was to dig up an earthworm, they would not adapt to the full heat, and try to dig back in again, to their original habitat. Oh yea, and if you do ever find an earthworm in your garden or so, the soil is good for you to plant, and the plants won't die unless you don't give them water. lol
50184
HAHAHAHAHAHA omg... seeing all your other questions then seeing this one? TOO FUNNY! ... Thanks Darius I needed to laugh today:)\n\nOkay, okay, okay, here is my real answer hope it helps....\n\nHow do porcupines make love? You would probably think the answer is "very carefully," but you would probably be wrong. The answer is more improbable and much more bizarre than that. I will explain further.... So the next time a friend asks you how porcupines make love, you can set them straight by describing these events (in as much detail as you dare). \n\nAnimals...\nIn the 1940's some ppl did a study on the sex life of a porcupine. They were kept in the Biology Dept. at the University of Buffalo. The colony consisted of 5 females (Maudie, Nightie, Prickles, Snooks and Skeezix) and 3 males (Old Dad, Pinkie,[1] and Johnnie).\n\nHere is what the found out about the Females:\n\nIt was noted that the animals of both sexes objected to being stroked or having their feet, tail base, or genitals touched by the authors. In July/August, as the mating season approached, the female porcupine would often rub her genitals on structures such as food and water dishes, sticks, and the cage wire. As the season progressed she sought and accepted more frequent tactile stimulation (presumably from the human investigators). As the mating season approached, young females become more nervous and excited and put more "vim, vigor and action" into their activities. They would even "seize, straddle, and ride sticks about the cage" walking erect and stimulating their genitalia with the stick. This period of excitement was followed by a stage the female went off her food, remained close to the male and "moped." During this period the female even accepted the insertion of a thermometer into the vagina (which she resisted at other times). \n\nAnd the male behavior:\n\nWhen placed in a cage with a female the male porcupine toured the whole area rubbing everything with his nose. He carefully smelled all items, paying closest attention to objects that had been in contact with the female and the places where she had urinated. He often walked about the cage on three legs, clutching at his genitals with his free left front paw. Like the females, the male rubbed his genitals on objects in the cage, and it appeared that the larger the object the more attractive as a rubbing place. The authors describe having to remove a one and a half inch spike from the frame of one cage as they feared that the animal’s vigorous rubbing would result in injury. Males also indulged in "stick riding" as described for females. Males would often "sing"[2] during this period and became more aggressive with other males. When the male encountered the female porcupine he smelled her all over, then reared up on his hind legs, his penis fully erect. If the female was not ready she ran away. If she was prepared for mating she also reared up and faced the male, belly-to-belly. In this position most males then sprayed the female with a strong stream of urine,[3] soaking her from head to foot.[4] She would either 1) object vocally, 2) strike with her front paws, as though boxing, 3) threaten or try to bite, or 4) shake off the urine and run away. If ready for mating the female did not object strongly to this shower. This courtship routine occurred several times in the days or weeks leading up to copulation. \n\nMating:\n\nMating occurred in November or December. While females at the peak of receptivity would accept any male, males required a period of close association with the females before they would mate with them. The male made sexual contact from behind the female. The spines of both animals were relaxed and lay flat. His thrusts were of the "usual nature" and were produced by flexing and straightening the knees. Males did not grasp the female in any way. Mating continued until the male was exhausted. Each time he broke awa