I completely agree with Secespitus' answer against this question and the 'anatomically correct' series of questions has already been discussed in Meta before as he links to.
That said; there is one element of SE that he doesn't address and I'd like to (respectfully) add - SE is decentralised by design.
The relative value of each contribution to the site is subjective. So is the interpretation of the closure reasons, as well as the relevancy of a question against a defined tag. This (while confusing at first) is actually one of SE's greatest strengths. It is a collegiate 'rulership' that determines what should be closed, what should be migrated and what is of relative value to the site. Like any college based decision making process, you get the advantage that the opinions of many minds generally average themselves out and you get the 'right' answer to these value judgments. That averaging process means (however) by definition that we don't always agree.
You're going to get people who vehemently disagree with you on almost everything. You're going to get people who seem to be in complete alignment with you all the time, and you'll see people who reside all along the spectrum between the two.
For example, Secespitus and I have not always agreed on which questions to close and the relative merits of certain answers, including each other's. But, I certainly agree with his answer here. The beauty of our relative anonymity (and I admit that I didn't get this at first myself) is that you're not judging the contributions of each other based on the person, or even the personality. You're judging the contribution on its merit, which is hard enough given the subjective nature of the assessment process.
So; do I personally think that your speculative biology questions are fit and proper for this site? Yes. But, I don't speak for every person who monitors the site and sometimes I hold the minority position.
The trick is not to be discouraged by that. Refine your question a bit, re-post. Highlight (as Secespitus points out) the speculative nature of your query to increase the chance it'll stay open.
In short, persist. I'll admit there are times that this site seems like a hostile place, but after being here for nearly 6 months I can confirm that such times are the exception. Most of us here really want to help; we want to teach and we want to provide great answers to great questions. To do that though, we need great questions. While comment fields are limited in size, many of the comments that come across as terse are really only trying for brevity so remember to consider them in that spirit, and take the constructive part of any criticism, use it to shape your question, and leave the rest.
Oh, and welcome to the site.