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May
21
awarded  Enlightened
May
21
awarded  Nice Answer
May
11
comment did pteranodons live in colonies?
By "Pteranodon" do you mean pterosaurs as a whole or specifically the genus Pteranodon?
May
11
comment Evolutionarily, why do male rats and horses lack nipples?
For rats at least, the answer is in your quote: because developmental sequences evolve. I don't think one need to posit an evolutionary reason for losing nipples, because in all likelihood that change was associated with some other developmental difference. And there is probably no way to know what the reason for the alteration of the timing of testosterone release.
May
1
awarded  Nice Answer
Apr
30
comment Is homosexuality an adaptation in humans?
Also see: biology.stackexchange.com/questions/7669/…
Apr
28
comment Does the DNA of a tadpole change after it becomes a frog?
Is your question a better fit for worldbuilding.SE? If so, we can migrate it there.
Apr
27
comment Human bone density and Brown Bear bone density?
The "ash fraction" value is the key here. Bear bone is 66% mineral. Typical human cortical bone is 65-70% mineral. So, no, bears don't have denser bones than humans.
Apr
27
comment Human bone density and Brown Bear bone density?
I have to think they are using density incorrectly, and since they provide no reference, we really can't check. There is no way that bone density, in the scientific sense, can be 10 times higher in bears. It says "for a given size," which indicates to me that it must mean some kind of skeleton as percentage of body mass. Or it's just made up, with no basis in observation.
Apr
24
comment Does the term “upper extremity” include hands?
I suspect that "hand" is separated out because it is often a surgical subspeciality. Hands are complicated.
Apr
23
answered Mammal vs Placental Mammal
Apr
22
awarded  Enlightened
Apr
22
awarded  Nice Answer
Apr
21
revised Applying kiwis on gelatin
Fixing spelling
Apr
21
revised What has caused life to choose this unfathomably tiny subset of all possible proteins?
Improve formatting
Apr
15
revised What is the mechanism behind plants losing their leaves?
Improving spelling
Apr
5
comment Bolyerine Snakes maxillary bone, split?
What figure(s) are you having trouble with in the paper?
Apr
3
comment The selective pressure of contraceptives
@canadianer Is there any work on novel selective pressures resulting from widespread use of contraceptives and can these selective pressures be modeled on the selective response in the same way as antibiotic resistance or strong truncating selection?
Apr
3
revised The selective pressure of contraceptives
Fixing up grammar
Apr
3
comment The selective pressure of contraceptives
The topic is certainly welcome. Your question was closed for being unclear rather than off topic. It would have been nice if any of those who voted to close would have explained why. I've editing the grammar a bit and given it some structure.