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Jun
17
comment Why are the organs for reproduction and urinary excretion combined?
@Abram You can just edit your answer to include more information.
Jun
15
awarded  Constituent
Jun
15
awarded  Enlightened
Jun
15
awarded  Nice Answer
Jun
15
revised Why are the organs for reproduction and urinary excretion combined?
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Jun
15
answered What is the mass of a pigeon tail feather?
Jun
15
answered Why are the organs for reproduction and urinary excretion combined?
Jun
8
awarded  Caucus
Jun
1
reviewed Leave Closed How does a virus reach its host, it is always passive?
Jun
1
reviewed Leave Closed Why “broad” instead of “large” cross-immunoreactivity?
May
27
reviewed No Action Needed Tree identification from dried branch
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.