Are earthworms sexually dimorphic?
917955
No, they are hermaphrodites, so the question does not apply, for obvious reasons.
817770
Most non-mammalian groups do. In mammals, the males are larger, but that is mostly realted to the fact that they fight for the attention of females and the chance to mate, so natural selection makes them bigger than the females.\nIn most other groups however, amphibians, reptiles, most insects, arachnids, many crustaceans and other invertebrates, the female is usually larger based on the simple fact that she must caryy eggs with her. Eggs are  much more bulky that live young, so the female must be larger in order to carry such a weight around. So, to answer your question, there are thousands, potentially millions of species that have larger feamles than males!\n\nlarge female, tiny male:\nhttp://bugguide.net/node/view/44206\n\nhope this answers your question!
1093885
You might want to do a little reading about hermaphroditism before you start asking such silly questions. \nHermaphrodites are people who have the external sexual characteristics of both sexes. They can choose which they prefer to be, and have surgery to remove the excess organs. But they are rarely fully developed. Most often they are almost vestiginal and in some cases their condition is overlooked in childhood and doesn't become evident until they hit puberty. \n\nCan't you find something better to do than pose such stupid questions as these?
1154604
About the first answerer, funny, but of course that's not possible to have superior evolution because of gender differences.\n\nTo the questioner, that's quite hard to measure, but you could argue that they are the best adapted to their enviornment becaue dark skin protects them from the sun.
607243
Flatworms and roundworms are as different as frogs and snakes. Or perhaps less different when we forget the science part of it.Flat worms hape a flat body, like tape.And they do not have a coelom. What is a coelom? If you cut open a higher animal (eg. a mouse)you will find that their body is like a hollow bag filled with liquids and organs. The empty space of the body in which these organs lie and which is filled up of body fluids is called coelom. In flat worms, this entire space is filled with compact tissue.Sexes are not separate and specialised cells called flame cells are responsible for excretion. In round worms, the coelom exists but is actually pseudocoelom or "false coelom". This means patches of tissue are present scattered in the coelom. Sexes are separate ie. males and females are separate. Moreover an excretory tube is responsible for excretion instead of flame cells.
879744
For the most part, males and females are genotypically the same until you reach Chromosome #23, the sex chromosomes.  For females, the 23rd chromosome is XX, while the males have XY.  They are labelled "X" and "Y" because they are shaped like the letters "X" and "Y" in their condensed forms.  \n\nThe embryo knows which sex to turn into based on the presence of the Y chromosome.  In all cases, all embryos will turn into a female UNLESS there is a Y chromosome.  The Y chromosome will trigger a series of biochemical pathways (which includes testosterone, the male hormone) that will activate some important items while inhibiting others.  The end-result is a male.\n\nIt has been argued that in evolution, the Y chromosome resulted from the cutting off of a portion of the X chromosome; it is up to you to decide whether or not you believe it.  \n\n\nPhenotypically, males and females differ in reproductive organs and breast development.  You might also be aware of the puberty onsets that take place in males and in females in their teens.  Males tend to have deeper voices than females, later growth spurts, and a more masculine physique.  Females begin their monthly cycles, and so on so forth.
68400
gummie worms. they are bigger.
23543
In zoology, a hermaphrodite is an organism of a species whose members possess both male and female sexual organs during their lives. In many species, hermaphroditism is a normal part of the life-cycle. Generally, hermaphroditism occurs in the invertebrates, although it occurs in a fair number of fish, and to a lesser degree in other vertebrates.\n\nSee below for use of the term in plants.\n\nNote: The term "hermaphrodite" has historically been used to describe people with ambiguous genitalia or biological sex. The broader term intersexual is often used and is preferred by many such individuals and medical professionals. The term is still used by the pornography industry, though often as a synonym for transexual, as true human intersexuals are rare.\n\n\nIn animals\nSequential hermaphrodite: The organism is born as one sex and later changes into the other sex. \nProtandry: When the organism starts as a male, and changes sex to a female later in life. \nExample: The seabasses (Family Serranidae). These are a highly sought food fish complex made up of primarily groupers. Since even a small male can produce more than enough sperm to fertilize a huge number of eggs, while a female's egg output increases greatly with an increase in size, this strategy makes sense for an organism (fish in general) where over 90% of the eggs laid will not result in a fish that reaches sexual maturity. It has been shown that fishing pressure actually is causing a change in when the switch from male to female occurs, since fishermen naturally prefer to catch the larger fish. The populations are generally changing sex at a smaller size, due to artificial selection.
833684
Butterflies have 6 legs...earthworms have none...
784409
absolutely...hermaphrodites occur in just about any living organism that has differentiated genders...it's caused by a mix-up in the genetic pattern that determines physical gender differences during gestation/maturation...
423334
worms like to come to the surface when its wet , not because they are drowning, but because its moist and they find mates.  Earth worms are hermaphrodites, and they lines up with each other with lots of slime and fertiliz each other.Once they are done they go back down burrows and deposit egg sac.
272720
yes there are all types my fav is the hermaphrodite this person has both penis and vagina from birth there are sex change operation as well need more look up hermaphrodite or sex change on yahoo
942359
Being an immature stage of development the reproductive organs are likely to be undeveloped too, ie no point in wasting energy on something not being used!?\n In contrast adult male and female butterflies and moths have well developed genital organs.
852864
I hope you don't mind, I saw your other question and also posted this response, so, this is cross posting with extra added ^_~\n\nYes, the institution of education should include proper information about human bodies, ALL human bodies.  I don't know about lower level education, except in biology, we learn that snails and worms are hermaphrodites, there are over 36,000 sexes of mushrooms..etc but intersexes are not "hermaphrodites" and mushrooms certainly aren't human ^_~ As far as post secondary education, I did attend one Sociology class that talked about intersexes briefly. As for resistance, I am in Student Govt. and recently proposed an event for International Intersex Solidarity Day (nov. th) before the Executive Counsil and was shot down faster than a nuclear missile heading to WA DC. because they didn't know what i was talking about. They suggested i hand it off to the rainbow club. I was livid!\n\nIntersexes are either genital shapes and sizes not congruent with current dominant standards of genital shape and size preferences.\n\nIntersexes are also people whose chromosome patterns might not be xx or xy (such as xxy or xxxy, or xxxo, or xo, or mosaic meaning a mix of chromosome patters across different cells)\n\nIntersexes are also a mix of both of the above two options.\n\nThe thing about labeling someone intersex, is that when people from the medical community are deciding whether or not to label someone intersex, they often fluctuate as there is not set standard of criterion across the board.\n\nSome use size standards, such as a phallus that is larger than .9cm is too large for a female, therefore if the doctor feels that the [infant] should have been female according to the doctors preferences looking at genitals and /or chromosomes etc the doctor might trim the phallus or remove it (social construction of the female sex)\n\nAnd if the phallus is smaller than 2.5cm and/or the doctor feels that the [infant] would be unable to stand while urinating as an adult, on an [infant] the doctor feels should have been male according to the doctors preferences looking at genitals and/or chromosomes etc, the doctor might choose to do genital reconstructions and possibly hormone replacement therapy to construct the [infant] as a female regardless of chromosomes etc.\n\nSex is on a spectrum, you see, where the categories of male and female are not static, meaning, not absolute categories, but rather made up of cultural preferences, they are invented labels put on varrying places on the sex spectrum in order to validate a cultures claims of categories of sex, to perpetuate the segregation of human beings.\n\nIntersexes are often marginalized or stigmatized by societies in order to preserve the western binary gender and sex systems which declare that there are only two sexes, and only two corresponding genders, that both are biological, and that the placement of certain sex and gender labels on human bodies mean something, signify something, often socially and religeously. For this reason, many intersexes are subjected to cosmetic surgery, isolation, shame, discrimination, invalidation, and less access to vital medical care and information about their bodies. And often when they are given medical care or information, it is in such a way that highlights cultural preferences/standards for "male" and "female" and downplays the validity of a natural human body which does not conform to these cultural preferences.
199066
nopes...they dont have vaginas. homosexuality is an attitude, a personal preferance. it has nothing to do with physical abnormality or anatomy.
390467
Coz men are men. It doesn't matters whether they're dense or not. All is different, each is unique. No offense, but perhaps you should ask why are you stereotyping.
902693
The answer is an unequivocal "NO"!  For starters, lets look at the rationale against such a proposition.  \n\nEvolutionarily speaking, sexual reproduction is important in that it has the advantage over asexual reproduction of mixing genetic combinations available to the offspring.  In the human species, this sexual reproduction requires both a male and a female.  What accompanies these facts is that the female is genetically prepared to carry a child once pregnant.  Such features which are vital to this are a uterus, the hormones estrogen and progesterone which prepare the uterus for implantation, ovaries to supply eggs, and a vaginal canal for birthing.  All of these features are primary sex characteristics that can only develop in the ABSENCE of a "Y" chromosome.  Evolutionarily, then, it is to the advantage of the species that phenotypic distinctions between males and females exist, and these physical differences preclude the possibility of the male of the species to be capable of pregnancy.  On this logic alone, men can not become pregnant.  But there is more evidence.\n\nSecondly, think about this:  humans and our ancestors have had millions of years to develop such features, if it were in fact possible, but it has NOT happened.  Why not?  Because there is no SELECTIVE ADVANTAGE for the human species of men acquiring these features and abilities. \n\nThird, there ARE cases of individuals that receive extra SEX chromosomes (look up Klinefelters and Turner' syndrome, for example) where individuals are born with XXY and XYY.  XXY individuals, as a rule, are infertile and can not produce children.  XYY individuals are fertile but are phenotypically male and do not develop uteruses and other features necessary to become impregnated.  So even in the cases of chromosal conditions that might perhaps favor male pregnancy, we do not observe males with the ability to be so.\n\nSo, IF a male had eggs they could not be fertilized because there is no way that the design of a male can receive semen into the genetalia.  But even if this were possible, there would be no place for the fertilized eggs to implant.  And if even they could implant, they couldnt grow because estrogen and progesterone are not present in high enough quantities in males to prepare the uterus (high levels of these hormones would have produced a female during development of the fetus).  This all boils down to the simple and obvious reality that males can not become pregnant.\n\nSomeone might perhaps argue, well it would be possible if certain mutations occurred.  This also is false.  Why?  Because evolution is a process that moves down a one-way street.  While such capability is present in lower organisms, higher animals are too specialized to be capable of such a transformation.  Even if all the proper sets of supposed mutations had amassed in one organism, that organism would either (one) not survive and be spontaneously aborted in utero, or (two) be born as an infertile individual.  Again, only lower animals with less well specialized sexual reproductive organs are capable of self-fertilization and "pregnancy" (flowering plants, for example, are capable of this).\n\nFinally, a genotypic male could undergo gender reassignment and become female, but a uterus and other "equipment" would have to be transplanted and various hormones taken.  I imagine, in theory, that this individual would be capable of becoming pregnant but in this scenario "he" is no longer "male".  \n\nGood question, but the answer is NO!