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Jun
18
comment What does the hominin phylogenetic tree look like?
No, it's fine as is. The tree is the tree and is (very likely) technically correct. It's just that the devil is in the details. I'm sure the bottom tree is equally poorly supported.
Jun
18
comment What does the hominin phylogenetic tree look like?
Great answer, but one thing to note about the upper tree is that the Bremer support values are really really low (0.2 to 0.5) particularly within Homo. So basically there is no resolution at that point. They may as well have a large polytomy at that point. This is not a fault of the authors but of all these fossils being fragmentary.
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?
Add link for slides
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.